CVE-2023-21819 Windows Secure Channel Denial of Service Vulnerability
Attackers can cause a denial of service in Windows Secure Channel, affecting Windows 10 and Server systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-21819?
CVE-2023-21819 is a high-severity denial of service vulnerability in Microsoft Windows 10 1809, published on 14 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Windows Secure Channel Denial of Service Vulnerability
Weakness: CWE-125
Which versions are affected by CVE-2023-21819?
It affects 7 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 10 20h2, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 21h2, Microsoft Windows Server 2019 and 1 more.
How do I fix CVE-2023-21819?
No fix has been published for CVE-2023-21819 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-21819 being exploited?
There is no known exploitation of CVE-2023-21819 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-f73c-qhrh-5x2f.