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Fencer Vulns
low 1.9

CVE-2025-11961 json

OOBR and OOBW in pcap_ether_aton() in libpcap

published 2025-12-31 10 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-205869

cvss
1.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • The Tcpdump Group libpcap 1.10.6
  • libpcap Debian 14 1.10.6-1

debian advisories DEBIAN-CVE-2025-11961

  • libpcap SLE Micro 5.5, SLE Micro 5.4, SLE Micro 5.3 1.10.1-150400.3.9.1
  • libpcap SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.10.5-160000.4.1
  • libpcap Linux Micro 6.0 1.10.4-4.1
  • libpcap Linux Micro 6.1 1.10.4-slfo.1.1_2.1
  • libpcap SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 1.10.5-150700.3.7.1
  • libpcap SLE Micro 5.2 1.9.1-150300.3.6.1
  • libpcap openSUSE Leap 15.6 1.10.4-150600.3.9.1
  • libpcap SLES LTSS Extended Security 12 SP5 1.8.1-10.9.1

suse advisories SUSE-SU-2026:0575-1SUSE-SU-2026:20120-1SUSE-SU-2026:20153-1SUSE-SU-2026:20048-1SUSE-SU-2026:20064-1SUSE-SU-2026:0063-1

  • libpcap openSUSE Leap 16.0 1.10.5-160000.4.1
  • libpcap openSUSE Tumbleweed 1.10.6-1.1

opensuse advisories openSUSE-SU-2026:20075-1openSUSE-SU-2026:10032-1

  • libpcap Alpine 3.23, Alpine 3.22, Alpine 3.21 1.10.7-r0
  • libpcap Alpine 3.24 1.10.6-r0

alpine advisories ALPINE-CVE-2025-11961

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libpcap Azure Linux 3.0 1.10.6-1
  • nmap Azure Linux 3.0 7.95-3
  • libpcap CBL-Mariner 2.0 1.10.1-5
  • nmap CBL-Mariner 2.0 7.93-4

azure linux advisories AZL-73335AZL-73344AZL-73373AZL-73379

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-11961 updated cvss 1.9

libpcap: libpcap: Memory corruption via malformed MAC-48 address input

  • Red Hat Enterprise Linux 6 libpcap
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libpcap Red Hat Enterprise Linux 8 libpcap Red Hat Enterprise Linux 9 libpcap Red Hat Enterprise Linux 10 libpcap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 1.9 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected products

  • The Tcpdump Group libpcap

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.