CVE-2021-44512

World-writable permissions on the /tmp/tmate/sessions directory in tmate-ssh-server 2.3.0 allow a...

7.0 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.26%Down 0.1 points since Dec 7, 2021

What each source reports

NVD Score used 7.0

Record: CVE-2021-44512
CVSS 3.1: 7.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 4.4 MediumAV:L/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-732
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-44512
Updated: 2026-11-02

EUVDEUVD-2021-31345 No score

Record: EUVD-2021-31345
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mpgw-pwqr-q9jp 7.0

World-writable permissions on the /tmp/tmate/sessions directory in tmate-ssh-server 2.3.0 allow a...

Record: GHSA-mpgw-pwqr-q9jp
CVSS 3.1: 7.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-281, CWE-732
Updated: 2026-11-02

OSV 7.0

Record: CVE-2021-44512
CVSS 3.1: 7.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-44512 7.0

Record: DEBIAN-CVE-2021-44512
CVSS 3.1: 7.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-44512 7.0

Record: UBUNTU-CVE-2021-44512
CVSS 3.1: 7.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

tmate tmate-ssh-server

Affected packages

Affected packages
Package	Affected	Fixed
`tmate-ssh-server` Debian:13	before 2.3.0-68-gd7334ee4-1	2.3.0-68-gd7334ee4-1
`tmate-ssh-server` Debian:14	before 2.3.0-68-gd7334ee4-1	2.3.0-68-gd7334ee4-1
`tmate-ssh-server` Ubuntu:22.04:LTS	All versions, plus listed versions 2.3.0-49-g97d20249-1	None known
`tmate-ssh-server` Ubuntu:24.04:LTS	All versions, plus listed versions 2.3.0-68-gd7334ee4-12.3.0-68-gd7334ee4-1build1	None known
`tmate-ssh-server` Ubuntu:25.10	All versions, plus listed versions 2.3.0-68-gd7334ee4-2	None known
`tmate-ssh-server` Ubuntu:26.10	All versions, plus listed versions 2.3.0-68-gd7334ee4-2build1	None known
`tmate-ssh-server` Ubuntu:26.04:LTS	All versions, plus listed versions 2.3.0-68-gd7334ee4-22.3.0-68-gd7334ee4-2build1	None known

History

History
Recorded	Changed	Sources
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-2021-44512 is a high vulnerability (CVSS 7.0) in Tmate Tmate-ssh-server, published December 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 18th percentile. Fixed in tmate-ssh-server 2.3.0-68-gd7334ee4-1.