Buffer overflow in The Tcpdump Group Libpcap
CVE-2025-11961
pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 1.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.001 (1.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- The Tcpdump Group Libpcap — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-11961?
- CVE-2025-11961 is a low-severity vulnerability in The Tcpdump Group Libpcap, classified under Heap-based Buffer Overflow. CVSS score: 1.9/10. Published 2025-12-31.
- How severe is CVE-2025-11961?
- Low severity. CVSS v3 base score is 1.9 out of 10.