🛡️ CVE-2021-44512 on Debian — tmate-ssh-server

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

World-writable permissions on the /tmp/tmate/sessions directory in tmate-ssh-server 2.3.0 allow a local attacker to compromise the integrity of session handling, or obtain the read-write session ID from a read-only session symlink in this directory.

Distribution advisory

This page covers CVE-2021-44512 as tracked by Debian, for the package tmate-ssh-server. The fix is available in version 2.3.0-68-gd7334ee4-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

DEBIAN-CVE-2021-44512 is recorded against 1 package.

tmate-ssh-server (fixed in 2.3.0-68-gd7334ee4-1)

Timeline and source

Published on 7 December 2021 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2021-44512 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2021-12-07

Updated 2026-08-12

Modified 2026-08-04

Fix URL N/A

Affected Packages

Software	From version	Fixed in
tmate-ssh-server	—	2.3.0-68-gd7334ee4-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2021-44512

🔗 NVD 🔗 Mitre

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