How severe is CVE-2021-44512?

CVE-2021-44512 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44512 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44512?

CVE-2021-44512 affects Tmate Tmate-ssh-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-44512?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-44512 published?

CVE-2021-44512 was published on 2021-12-07 and last updated on 2026-06-17.

CVE-2021-44512

CVE-2021-44512 is a high-severity vulnerability in Tmate Tmate-ssh-server with a CVSS 3.x base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: High (CVSS 3.x base score 7.0)
CVSS v2: 4.4
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Tmate Tmate-ssh-server
Published: 2021-12-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-44512?: 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.
How severe is CVE-2021-44512?: CVE-2021-44512 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-44512 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44512?: CVE-2021-44512 affects Tmate Tmate-ssh-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-44512?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-44512 published?: CVE-2021-44512 was published on 2021-12-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tmate:tmate-ssh-server:*:*:*:*:*:*:*:*

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