TI-2020-16629 Aliases CVE-2020-27347 GHSA-xp5q-c655-9565

tmux stack buffer overflow in function input_csi_dispatch_sgr_colon

LOW 39CWE-121Published 2020-11-06 · Updated 2024-09-17

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

In tmux before version 3.1c the function input_csi_dispatch_sgr_colon() in file input.c contained a stack-based buffer-overflow that can be exploited by terminal output.

Why it matters now

EPSS 0.00693 53rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed tmux (tmux): 3.1ctmux (Ubuntu): 3.1b-1ubuntu0.1, 3.0a-2ubuntu0.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
tmux	tmux	before 3.1c	3.1c	Patch available	CNA
Ubuntu	tmux	3.1b to before 3.1b-1ubuntu0.1; 3.0a to before 3.0a-2ubuntu0.2	3.1b-1ubuntu0.1, 3.0a-2ubuntu0.2	Patch available	CNA

tmux Vendortmux Affected before 3.1c Fixed in 3.1c Patch available CNA
tmux VendorUbuntu Affected 3.1b to before 3.1b-1ubuntu0.1; 3.0a to before 3.0a-2ubuntu0.2 Fixed in 3.1b-1ubuntu0.1, 3.0a-2ubuntu0.2 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tmux_project:tmux::::::::	2.9 – 3.1b	Vulnerable	Tmux Project

cpe:2.3:a:tmux_project:tmux:*:*:*:*:*:*:*:* Versions 2.9 – 3.1b Vulnerable ·Tmux Project

Remediation

Fix · CNA tmux (tmux) Fixed in 3.1c
Fix · CNA tmux (Ubuntu) Fixed in 3.1b-1ubuntu0.1, 3.0a-2ubuntu0.2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 3 products

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2020-27347
2026-10-03 Alias added: GHSA-xp5q-c655-9565

References

Exploit 1

https://www.openwall.com/lists/oss-security/2020/11/05/3

Patch 1

https://github.com/tmux/tmux/commit/a868bacb46e3c900530bed47a1c6f85b0fbe701c

Advisory 2

TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
TI-2007-05153 Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD… CVSS 2.0HIGH 7.2
TI-2004-01032 Multiple vulnerabilities in the IGMP functionality for Linux kernel 2.4.22 to 2.4.28, and… CVSS 2.0HIGH 10.0
TI-2004-00896 Multiple buffer overflows in libXML 2.6.12 and 2.6.13 (libxml2), and possibly other… CVSS 2.0HIGH 10.0
TI-2004-00800 Buffer overflow in the QFILEPATHINFO request handler in Samba 3.0.x through 3.0.7 may… CVSS 2.0HIGH 10.0
TI-2004-00962 Buffer overflow in the exif_read_data function in PHP before 4.3.10 and PHP 5.x up to… CVSS 2.0HIGH 10.0

See all 129 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences