CVE-2021-44512

Name: CVE-2021-44512
Creator: NVD / NIST
Published: 2021-12-07T03:15:07.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2021-44512 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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.. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7/10

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

EPSS Probability

0.25%

16.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Tmate	Tmate-Ssh-Server	<= 2.3.0

References

https://github.com/tmate-io/tmate-ssh-server/commit/1c020d1f5ca462f5b150b46a027aaa1bbe3c9596Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/12/06/2Mailing List, Third Party Advisory
https://github.com/tmate-io/tmate-ssh-server/commit/1c020d1f5ca462f5b150b46a027aaa1bbe3c9596Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/12/06/2Mailing List, Third Party Advisory

Timeline

Published: Dec 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44512?

How severe is CVE-2021-44512?

CVE-2021-44512 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44512?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-44512?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST