INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Windows Server 2016 Experiences 0xc0000409 Errors with August Updates

| 2026-09-08 15:22 CRITICAL HIGH DATA BREACH
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Executive Summary
AI-generated
On 2026-09-08, a breach of the Florida "DAVID" DMV database was reported by ShinyHunters hackers. The targeted sector is not specified in this source but it appears to be related to cybersecurity and technology developments. Microsoft's September 2026 Patch Tuesday fixes 966 flaws, including two zero-days, which may have been exploited in this breach. However, the exact details of how the attack worked are unclear from this article alone. The current status is that ShinyHunters hackers claimed responsibility for the breach, but no further information on the impact or affected number of individuals is provided in this source.
Technical Mitigations AI-generated
• Network Intrusion Prevention (ATT&CK mitigation for Phishing): Network intrusion prevention systems and systems designed to scan and remove malicious email attachments or links can be used to block activity. • Restrict Web-Based Content (ATT&CK mitigation for Phishing): Determine if certain websites or attachment types (ex: .scr, .exe, .pif, .cpl, etc.) that can be used for phishing are necessary for business operations and consider bloc • Reset credentials and API keys that may have been exposed, and review access logs for the affected accounts or integrations.
Technical Observables Login Required
Indicators of Compromise (IoCs) Protected

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Intelligence Metadata
Actors / Malware / CVEs / Campaigns
ShinyHuntersShinyHunters
Target & Sectors
NORTH_AMERICA NORTH_AMERICA
Incident Timeline
‎2016 August
August updates for Windows Server 2016 triggered a 0xc0000409 error on the system.
infrastructure Windows
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
tactic T1584.004 - Server
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
infrastructure 2016 Windows Server
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
‎June 2026
Microsoft fixed a known issue in Windows Server 2016 that caused June 2026 security updates to fail on systems not up to date.
infrastructure Windows
In June, Microsoft fixed another Windows Server 2016 known issue that caused June 2026 security updates to fail on systems that weren't up to date.
tactic T1584.004 - Server
In June, Microsoft fixed another Windows Server 2016 known issue that caused June 2026 security updates to fail on systems that weren't up to date.
organisation EU CRA
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organisation The Blue Report 2026
The Blue Report 2026 measures defenses technique by technique across 338 million simulations run in customer production environments.
‎August 2026
The August 2026 Windows security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
infrastructure Windows
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
Microsoft Compatibility Appraiser, which controls CompatTelRunner and is a Windows Compatibility Telemetry component, is a background system task that checks if the device meets the hardware and software requirements for the next major Windows cumulative update or feature upgrade.
" Microsoft is working on a fix that will ship with a future Windows update and has not yet shared a timeline for a permanent solution.
tactic T1584.004 - Server
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
organisation Compatibility Appraiser
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
data_breach 0 September
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
infrastructure 2016 Windows Server
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
observable CompatTelRunner.exe
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
organisation Originating
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
organisation Application Error
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
organisation Microsoft MVP
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
general_metric 1000 Event ID
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
organisation Microsoft Compatibility Appraiser
Microsoft Compatibility Appraiser, which controls CompatTelRunner and is a Windows Compatibility Telemetry component, is a background system task that checks if the device meets the hardware and software requirements for the next major Windows cumulative update or feature upgrade.
organisation Windows Compatibility Telemetry
Microsoft Compatibility Appraiser, which controls CompatTelRunner and is a Windows Compatibility Telemetry component, is a background system task that checks if the device meets the hardware and software requirements for the next major Windows cumulative update or feature upgrade.
‎2026/09/01
Threat actors used recent August updates to trigger 0xc0000409 errors on Windows Server 2016.
infrastructure Windows
Last week, it also warned customers that they may experience application crashes on some Windows Server 2025 because of recent memory management changes.
tactic T1584.004 - Server
Last week, it also warned customers that they may experience application crashes on some Windows Server 2025 because of recent memory management changes.
‎September 2026
Microsoft released September 2026 Patch Tuesday fixes, addressing 966 flaws and two zero-days, which may have triggered the 0xc0000409 error on Windows Server 2016.
organisation Microsoft
[Image 2: Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days]( * !
general_metric 966 flaws
[Image 2: Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days]( * !
general_metric 2 days
[Image 2: Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days]( * !
‎September 8, 2026
Microsoft released an August 2026 security update that may trigger the 0xc0000409 error on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
infrastructure Windows
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
tactic T1584.004 - Server
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
organisation Compatibility Appraiser
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
data_breach 0 September
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
‎2003 - 2026
Bleeping Computer's August updates triggered 0xc0000409 errors on Windows Server 2016.
organisation Social & Feeds
* Advertising * Write for BleepingComputer * Social & Feeds * Changelog Terms of Use - Privacy Policy - Ethics Statement - Affiliate Disclosure Copyright @ 2003 - 2026 Bleeping Computer® LLC - All Rights Reserved []( "Back to Top")
‎2026/09/08
Threat actors used the August updates to target 258 organizations with a vulnerability in Microsoft 365, specifically exploiting CompatTelRunner and KB5120418, which caused memory corruption errors on Windows Server 2016.
infrastructure Microsoft 365
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
organisation BigBear Microsoft 365
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
organisation MFA
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
victims 258 organizations
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
infrastructure Windows
August updates trigger 0xc0000409 errors on Windows Server 2016.
[Image 11: How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11]( * !
[Image 12: How to use the Windows Registry Editor How to use the Windows Registry Editor]( * !
[Image 13: How to backup and restore the Windows Registry How to backup and restore the Windows Registry]( * !
[Image 14: How to start Windows in Safe Mode How to start Windows in Safe Mode]( * !
[Image 16: How to show hidden files in Windows 7 How to show hidden files in Windows 7]( * !
[Image 17: How to see hidden files in Windows How to see hidden files in Windows]( * Webinars * Downloads * Latest * Most Downloaded * !
[Image 34: ThreatLocker]( * Home * News * Microsoft * August updates trigger 0xc0000409 errors on Windows Server 2016 # August updates trigger 0xc0000409 errors on Windows Server 2016
Get the report ### Related Articles: Microsoft: Windows Server 2025 changes causing app crashes Microsoft asks users to ignore 'Antivirus is turned off' errors Microsoft: August updates break printing, PDF export in WPF apps Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings * 0xc0000409 * CompatTelRunner * KB5120418 * Known Issue * Microsoft * Windows * Windows Server *
organisation Stack Protection
[Image 11: How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11]( * !
organisation Windows Registry
[Image 12: How to use the Windows Registry Editor How to use the Windows Registry Editor]( * !
organisation the Windows Registry
[Image 13: How to backup and restore the Windows Registry How to backup and restore the Windows Registry]( * !
infrastructure 2016 Windows Server
[Image 34: ThreatLocker]( * Home * News * Microsoft * August updates trigger 0xc0000409 errors on Windows Server 2016 # August updates trigger 0xc0000409 errors on Windows Server 2016
organisation ThreatLocker
[Image 34: ThreatLocker]( * Home * News * Microsoft * August updates trigger 0xc0000409 errors on Windows Server 2016 # August updates trigger 0xc0000409 errors on Windows Server 2016
organisation PDF
Get the report ### Related Articles: Microsoft: Windows Server 2025 changes causing app crashes Microsoft asks users to ignore 'Antivirus is turned off' errors Microsoft: August updates break printing, PDF export in WPF apps Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings * 0xc0000409 * CompatTelRunner * KB5120418 * Known Issue * Microsoft * Windows * Windows Server *
organisation WPF
Get the report ### Related Articles: Microsoft: Windows Server 2025 changes causing app crashes Microsoft asks users to ignore 'Antivirus is turned off' errors Microsoft: August updates break printing, PDF export in WPF apps Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings * 0xc0000409 * CompatTelRunner * KB5120418 * Known Issue * Microsoft * Windows * Windows Server *
infrastructure Linux
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
organisation APM
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
organisation Hackers
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
organisation VMware
1/1 Skip Ad Continue watching after the ad!Image 36: Loading PodsVisit Advertiser websiteGO TO PAGE Video 1 Video 2 Video 3 Video 4 Video 5 Video 6 Video 7 According to Microsoft, this known issue impacts both physical devices and virtual machines, including VMware and Azure environments.
organisation Magento
[Image 3: Adobe fixes critical Magento zero-day exploited to backdoor servers Adobe fixes critical Magento zero-day exploited to backdoor servers]( * !
organisation Adobe
[Image 3: Adobe fixes critical Magento zero-day exploited to backdoor servers Adobe fixes critical Magento zero-day exploited to backdoor servers]( * !
threat_actor ShinyHunters
[Image 4: ShinyHunters hackers claim breach of Florida ShinyHunters hackers claim breach of Florida "DAVID" DMV database]( * !
organisation DMV
[Image 4: ShinyHunters hackers claim breach of Florida ShinyHunters hackers claim breach of Florida "DAVID" DMV database]( * !
organisation DoppelCart
[Image 7: DoppelCart fraud network uses 119,000 fake shops to steal credit cards DoppelCart fraud network uses 119,000 fake shops to steal credit cards]( * !
organisation IP
[Image 31: How to change IP address.jpg) How to change IP address]( * !
organisation safely.jpg
Access the dark web safely.jpg)
organisation Address Windowing Extensions
This issue only affects apps that use Address Windowing Extensions (AWE), a set of extensions that lets them use more than 4GB of physical memory within a 32-bit virtual address space.
organisation AWE
This issue only affects apps that use Address Windowing Extensions (AWE), a set of extensions that lets them use more than 4GB of physical memory within a 32-bit virtual address space.
data_breach 4 GB
This issue only affects apps that use Address Windowing Extensions (AWE), a set of extensions that lets them use more than 4GB of physical memory within a 32-bit virtual address space.
organisation CTI
[Image 46: CTI Starter Kit + 2026 SANS CTI Survey CTI Starter Kit + 2026 SANS CTI Survey]( Upcoming Webinar !
organisation Upcoming Webinar
[Image 38: ThreatLocker]( Upcoming Webinar !
organisation ClickFix
Blockchain Over 5,400 hacked sites serve ClickFix payloads stored on the blockchain]( S ponsor Posts * !
organisation Freestar.com
Image 49!Image 50!Image 51!Image 52!Image 53!Image 54!Image 55!Image 56!Image 57!Image 58!Image 59 Freestar.com !
Tactical Metrics
Metrics
infrastructure
‎Microsoft 365
Affected Product
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
Metrics
victims
258
Organizations
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
Metrics
infrastructure
‎Windows
Affected Product
August updates trigger 0xc0000409 errors on Windows Server 2016.
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
[Image 11: How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11]( * !
[Image 12: How to use the Windows Registry Editor How to use the Windows Registry Editor]( * !
[Image 13: How to backup and restore the Windows Registry How to backup and restore the Windows Registry]( * !
[Image 14: How to start Windows in Safe Mode How to start Windows in Safe Mode]( * !
[Image 16: How to show hidden files in Windows 7 How to show hidden files in Windows 7]( * !
[Image 17: How to see hidden files in Windows How to see hidden files in Windows]( * Webinars * Downloads * Latest * Most Downloaded * !
[Image 34: ThreatLocker]( * Home * News * Microsoft * August updates trigger 0xc0000409 errors on Windows Server 2016 # August updates trigger 0xc0000409 errors on Windows Server 2016
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
Microsoft Compatibility Appraiser, which controls CompatTelRunner and is a Windows Compatibility Telemetry component, is a background system task that checks if the device meets the hardware and software requirements for the next major Windows cumulative update or feature upgrade.
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
" Microsoft is working on a fix that will ship with a future Windows update and has not yet shared a timeline for a permanent solution.
In June, Microsoft fixed another Windows Server 2016 known issue that caused June 2026 security updates to fail on systems that weren't up to date.
Last week, it also warned customers that they may experience application crashes on some Windows Server 2025 because of recent memory management changes.
Get the report ### Related Articles: Microsoft: Windows Server 2025 changes causing app crashes Microsoft asks users to ignore 'Antivirus is turned off' errors Microsoft: August updates break printing, PDF export in WPF apps Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings * 0xc0000409 * CompatTelRunner * KB5120418 * Known Issue * Microsoft * Windows * Windows Server *
Metrics
infrastructure
2,016
Windows Server
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
[Image 34: ThreatLocker]( * Home * News * Microsoft * August updates trigger 0xc0000409 errors on Windows Server 2016 # August updates trigger 0xc0000409 errors on Windows Server 2016
"After installing the August 2026 Windows security update (the Originating KBs listed above), some Windows Server 2016 devices might generate recurring Application Error events (Event ID 1000, with exception code 0xc0000409) associated with CompatTelRunner.exe," Microsoft explained in a service alert spotted by Microsoft MVP Susan Bradley.
Metrics
infrastructure
‎Linux
Affected Product
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
Metrics
data_breach
0
September
By ###### Sergiu Gatlan * September 8, 2026 * 11:22 AM * 0 !Image 35: Windows Server Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled.
Metrics
data_breach
4
Gb
This issue only affects apps that use Address Windowing Extensions (AWE), a set of extensions that lets them use more than 4GB of physical memory within a 32-bit virtual address space.
Intelligence Sources
BleepingComputer 2026-09-08