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Fencer Vulns
high 8.8

CVE-2021-27229 json

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 tex…

published 2021-02-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13994

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • mumble mumble 1.3.4
  • mumble Debian 14, Debian 13, Debian 12 1.3.4-1

debian advisories DEBIAN-CVE-2021-27229

  • mumble Ubuntu 18.04 LTS 1.2.19-1ubuntu1.1
  • mumble Ubuntu 20.04 LTS 1.3.0+dfsg-1ubuntu0.1
  • mumble Ubuntu 22.04 LTS 1.3.4-1
  • mumble Ubuntu Pro 16.04 LTS 1.2.12-1ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2021-27229

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mumble openSUSE Tumbleweed 1.3.4-2.7

opensuse advisories openSUSE-SU-2024:11065-1

  • mumble Alpine 3.13 1.3.3-r6
  • mumble Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 1.3.4-r0

alpine advisories ALPINE-CVE-2021-27229

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

  • mumble Arch Linux 1.3.4-1

arch linux advisories AVG-1576

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-2021-27229 updated cvss 8.8

mumble: remote code execution if a victim navigates to a crafted URL

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

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

Exploit prediction

3.20% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

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.