Vulnerability · Published Dec 7, 2021 · Assigned by mitre
CVE-2021-44512
High 7.0
In plain English
A high-severity security flaw in the tmate-ssh-server package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.0High
Exploit odds (30 days)0.3%top 81.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | tmate-ssh-server | 2.3.0-68-gd7334ee4-1 | DEBIAN-CVE-2021-44512 |
| Debian:14 | tmate-ssh-server | 2.3.0-68-gd7334ee4-1 | DEBIAN-CVE-2021-44512 |
| Ubuntu:22.04:LTS | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44512 |
| Ubuntu:24.04:LTS | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44512 |
| Ubuntu:25.10 | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44512 |
| Ubuntu:26.04:LTS | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44512 |
| Ubuntu:26.10 | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44512 |