Vulnerability · Published Dec 7, 2021 · Assigned by mitre
CVE-2021-44513
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 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.0High
Exploit odds (30 days)0.2%top 87.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Insecure creation of temporary directories in tmate-ssh-server 2.3.0 allows a local attacker to compromise the integrity of session handling.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | tmate-ssh-server | 2.3.0-68-gd7334ee4-1 | DEBIAN-CVE-2021-44513 |
| Debian:14 | tmate-ssh-server | 2.3.0-68-gd7334ee4-1 | DEBIAN-CVE-2021-44513 |
| Ubuntu:22.04:LTS | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44513 |
| Ubuntu:24.04:LTS | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44513 |
| Ubuntu:25.10 | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44513 |
| Ubuntu:26.04:LTS | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44513 |
| Ubuntu:26.10 | tmate-ssh-server | no fix listed | UBUNTU-CVE-2021-44513 |