What is CVE-2025-13946?

CVE-2025-13946 is a medium-severity vulnerability in Wireshark, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2025-12-03.

How severe is CVE-2025-13946?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Wireshark

CVE-2025-13946

MEGACO dissector infinite loop in Wireshark 4.6.0 to 4.6.1 and 4.4.0 to 4.4.11 allows denial of service

Published 2025-12-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.001 · change: -0.000

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0, 4.4.0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

www.wireshark.org/security/wnpa-sec-2025-08.html (Issue Tracking, Vendor Advisory)
gitlab.com/wireshark/wireshark/-/issues/20884 (issue-tracking, Exploit, permissions-required, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2025-13946?: CVE-2025-13946 is a medium-severity vulnerability in Wireshark, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2025-12-03.
How severe is CVE-2025-13946?: Medium severity. CVSS v3 base score is 5.5 out of 10.