What is CVE-2021-31272?

CVE-2021-31272 is a critical-severity vulnerability in Serenityos, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-06-18.

How severe is CVE-2021-31272?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Path Traversal in Serenityos

CVE-2021-31272

SerenityOS before commit 3844e8569689dd476064a0759d704bc64fb3ca2c contains a directory traversal vulnerability in tar/unzip that may lead to command execution or privilege escalation.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2021-06-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.032 (87.6th percentile), scored 2026-10-09.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000

Affected products

Serenityos

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/SerenityOS/serenity/issues/3991 (Third Party Advisory)
github.com/SerenityOS/serenity/issues/3992 (Third Party Advisory)
github.com/SerenityOS/serenity/pull/5713/commits/3844e8569689dd476064a0759d704b… (Patch, Third Party Advisory)
github.com/SerenityOS/serenity/pull/5713 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-31272?: CVE-2021-31272 is a critical-severity vulnerability in Serenityos, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-06-18.
How severe is CVE-2021-31272?: Critical severity. CVSS v3 base score is 9.8 out of 10.