CVE-2025-11964
OOBW in utf_16le_to_utf_8_truncated() in libpcap
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
OOBW in utf_16le_to_utf_8_truncated() in libpcap
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.
- Record
CVE-2025-11964- CVSS 3.1
- 1.9 Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2025-205868
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.
- Record
EUVD-2025-205868- CVSS 3.1
- 1.9 Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-53h7-g6w8-rxxc
On Windows only, if libpcap needs to convert a Windows error message to UTF-8 and the message...
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.
- Record
GHSA-53h7-g6w8-rxxc- CVSS 3.1
- 1.9 Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-11964- CVSS 3.1
- 1.9 Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
OSV
OOBW in utf_16le_to_utf_8_truncated() in libpcap
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.
- Record
CVE-2025-11964- CVSS 3.1
- 1.9 Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-11964
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.
- Record
UBUNTU-CVE-2025-11964- CVSS 3.1
- 1.9 Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-11964 is a low vulnerability (CVSS 1.9) in The Tcpdump Group Libpcap, published December 31, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. No source names a fixed version.
References
github.com/the-tcpdump-group/libpcap/commit/7fabf607f2319a36a0bd78444247180acb838e69
nvd.nist.gov/vuln/detail/CVE-2025-11964
ubuntu.com/security/CVE-2025-11964
cve.org/CVERecord?id=CVE-2025-11964