CVE-2025-11964 OOBW in utf_16le_to_utf_8_truncated() in libpcap
A buffer overflow in libpcap on Windows allows attackers to write beyond buffer boundaries when converting specific UTF-16 error messages, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-11964?
CVE-2025-11964 is a low-severity memory corruption vulnerability in The Tcpdump Group libpcap, published on 31 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On Windows only, if libpcap needs to convert a Windows error message to UTF-8 and the message includes characters that UTF-8 represents using 4 bytes, utf_16le_to_utf_8_truncated() can write data beyond the end of the provided buffer.
Weakness: CWE-787
Which versions are affected by CVE-2025-11964?
How do I fix CVE-2025-11964?
No fix has been published for CVE-2025-11964 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-11964 being exploited?
There is no known exploitation of CVE-2025-11964 in the wild and no public exploit code.
Sources
Also known as GHSA-53h7-g6w8-rxxc.