CVE-2021-27229

Mumble before 1.3.4 allows remote code execution if a victim navigates to a crafted URL on a...

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

3.20%Up 0.8 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

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.

Record: CVE-2021-27229
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-59
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2021-27229
Updated: 2026-11-02

EUVDEUVD-2021-13994 No score

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.

Record: EUVD-2021-13994
Updated: 2026-11-03

GitHub AdvisoriesGHSA-58v9-jf45-v492 8.8

Mumble before 1.3.4 allows remote code execution if a victim navigates to a crafted URL on a...

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.

Record: GHSA-58v9-jf45-v492
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-59
Updated: 2026-11-02

OSVALPINE-CVE-2021-27229 8.8

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.

Record: ALPINE-CVE-2021-27229
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-03

OSV 8.8

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.

Record: CVE-2021-27229
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

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OSVDEBIAN-CVE-2021-27229 8.8

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.

Record: DEBIAN-CVE-2021-27229
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-27229 8.8

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.

Record: UBUNTU-CVE-2021-27229
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2021-0125 No score

Updated mumble packages fix a security vulnerability

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 (CVE-2021-27229).

Record: MGASA-2021-0125
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11065-1 No score

mumble-1.3.4-2.7 on GA media

These are all security issues fixed in the mumble-1.3.4-2.7 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11065-1
Updated: 2026-11-02

OSVUSN-5195-1 No score

mumble vulnerability

It was discovered that the Mumble client supported websites for public servers with arbitrary URL schemes. If a user were tricked into visiting a malicious website from the public server list, a remote attacker could possibly execute arbitrary code.

Record: USN-5195-1
Updated: 2026-11-02

OSVUSN-5195-2 No score

mumble vulnerability

Record: USN-5195-2
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mumble` Alpine:v3.13	before 1.3.3-r6	1.3.3-r6
`mumble` Alpine:v3.14	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.15	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.16	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.17	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.18	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.19	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.20	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.21	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.22	before 1.3.4-r0	1.3.4-r0

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Affected packages
Package	Affected	Fixed
`mumble` Alpine:v3.23	before 1.3.4-r0	1.3.4-r0
`mumble` Alpine:v3.24	before 1.3.4-r0	1.3.4-r0
`mumble` Debian:12	before 1.3.4-1	1.3.4-1
`mumble` Debian:13	before 1.3.4-1	1.3.4-1
`mumble` Debian:14	before 1.3.4-1	1.3.4-1
`mumble` Debian:9	before 1.2.18-1+deb9u2, plus listed versions 1.2.18-11.2.18-1+deb9u1	1.2.18-1+deb9u2
`mumble` Mageia:7	before 1.3.4-1.mga7	1.3.4-1.mga7
`mumble` Mageia:8	before 1.3.4-1.mga8	1.3.4-1.mga8
`mumble` Ubuntu:Pro:16.04:LTS	before 1.2.12-1ubuntu1+esm1, plus listed versions 1.2.8-2ubuntu11.2.12-1ubuntu1	1.2.12-1ubuntu1+esm1
`mumble` Ubuntu:18.04:LTS	before 1.2.19-1ubuntu1.1, plus listed versions 1.2.18-11.2.19-11.2.19-1build11.2.19-1ubuntu1	1.2.19-1ubuntu1.1
`mumble` Ubuntu:20.04:LTS	before 1.3.0+dfsg-1ubuntu0.1, plus listed versions 1.3.0+dfsg-11.3.0+dfsg-1build1	1.3.0+dfsg-1ubuntu0.1
`mumble` Ubuntu:22.04:LTS	before 1.3.4-1	1.3.4-1
`mumble` openSUSE:Tumbleweed From an advisory covering 2 CVEs	before 1.3.4-2.7	1.3.4-2.7

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	affected, aliases, references	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-27229 is a high vulnerability (CVSS 8.8) in Mumble, published February 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.20%, the 88th percentile. Fixed in mumble 1.3.3-r6.

References

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