CVE-2023-21556 Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
An integer overflow in Windows L2TP allows remote attackers to execute arbitrary code on affected 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-2023-21556?
CVE-2023-21556 is a high-severity vulnerability in Microsoft Windows 10 1607, published on 10 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability
Weakness: CWE-191
Which versions are affected by CVE-2023-21556?
It affects 15 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 20h2, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 21h2 and 9 more.
How do I fix CVE-2023-21556?
No fix has been published for CVE-2023-21556 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-21556 being exploited?
There is no known exploitation of CVE-2023-21556 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-f98r-hf6q-m8m3.