CVE-2025-11964: the tcpdump group libpcap Out-of-bounds Write
CVSS: 1.9v3.1LowDeferred
AliasesUBUNTU-CVE-2025-11964
Published 31-12-2025Last modified 02-01-2026
Vulnerability summary
CVE-2025-11964 is a low (CVSS 1.9) Out-of-bounds Write vulnerability in the tcpdump group libpcap. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.
CVSS score
1.9/10
010
Low · v3.1 (CVE.org)EPSS score
0.12%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 31-12-2025PublishedVulnerability first disclosed.
- 02-01-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 versionLow 1.9Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated1.9LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
- NVDNIST1.9LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.12%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
0.00 pp
From 0.12% on 18-09-2026
18-09-202618-10-2026
EPSS score0.12%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
The tcpdump group1 product
- libpcap≥ 1.10.0, < 1.10.6
Ubuntu1 product
- libpcapAll versions (No fix recorded)
2 vendors · 2 products