What is CVE-2021-27229?

CVE-2021-27229 is a high-severity vulnerability in Mumble, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2021-02-16.

How severe is CVE-2021-27229?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Mumble

CVE-2021-27229

Mumble before 1.3.4 allows remote code execution if a victim navigates to a crafted URL on a server list and clicks on the Open Webpage text.

Published 2021-02-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.032 (87.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000

Affected products

Mumble
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

github.com/mumble-voip/mumble/compare/1.3.3...1.3.4 (Patch, Third Party Advisory)
github.com/mumble-voip/mumble/pull/4733 (Patch, Third Party Advisory)
github.com/mumble-voip/mumble/commit/e59ee87abe249f345908c7d568f6879d16bfd648 (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2021/02/msg00022.html (mailing-list, Mailing List, Third Party Advisory)
security.gentoo.org/glsa/202105-13 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27229?: CVE-2021-27229 is a high-severity vulnerability in Mumble, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2021-02-16.
How severe is CVE-2021-27229?: High severity. CVSS v3 base score is 8.8 out of 10.