Vulnerability · Published Dec 31, 2025 · Assigned by Tcpdump
CVE-2025-11964OOBW in utf_16le_to_utf_8_truncated() in libpcap
Low 1.9
In plain English
A low-severity out-of-bounds write in libpcap from The Tcpdump Group. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)1.9Low
Exploit odds (30 days)0.1%top 98.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2025-11964 |
| Ubuntu:24.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2025-11964 |
| Ubuntu:25.10 | libpcap | no fix listed | UBUNTU-CVE-2025-11964 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Tcpdump Group | libpcap | 1.10.0 – before 1.10.6 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N