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CVE-2020-27347— tmux stack buffer overflow in function input_csi_dispatch_sgr_colon

Quick assessment

Affected
tmux tmux
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tmux是一款开源的终端多路复用器。 Tmux input.c 中的input_csi_dispatch_sgr_colon()函数存在缓冲区错误漏洞，攻击者可由终端输出利用该漏洞。

CVSS 8.8 · High EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-27347

Vulnerability Information
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Vulnerability Title
tmux stack buffer overflow in function input_csi_dispatch_sgr_colon
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
tmux 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tmux是一款开源的终端多路复用器。 Tmux input.c 中的input_csi_dispatch_sgr_colon()函数存在缓冲区错误漏洞，攻击者可由终端输出利用该漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tmux tmux unspecified ~ 3.1c -
Ubuntu tmux 3.1b ~ 3.1b-1ubuntu0.1 -

II. Public POCs for CVE-2020-27347

# POC Description Source Link Shenlong Link
1 Enhanced fuzzing for tmux using OSS-Fuzz. Includes custom `cmd-fuzzer` and `argument-fuzzer` harnesses for improved code coverage and a PoC for `CVE-2020-27347` https://github.com/lucadibello/tmux-fuzzing POC Details
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III. Intelligence Information for CVE-2020-27347

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Patches & Fixes for CVE-2020-27347 (1)

Mailing List Discussions for CVE-2020-27347 (1)

Other References for CVE-2020-27347 (1)

IV. Related Vulnerabilities

Same product: tmux
Same weakness: CWE-121

V. Comments for CVE-2020-27347

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