What is CVE-2016-20021?

CVE-2016-20021 is a critical-severity vulnerability in Gentoo Portage, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2024-01-12.

How severe is CVE-2016-20021?

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

Is CVE-2016-20021 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Gentoo Portage

CVE-2016-20021

In Gentoo Portage before 3.0.47, there is missing PGP validation of executed code: the standalone emerge-webrsync downloads a .gpgsig file but does not perform signature verification. Unless emerge-webrsync is used, Portage is not vulnerab…

EPSS: 0.005 (36.8th percentile) — read the EPSS interpretation.

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.

Affected products

Gentoo Portage
N/a — versions n/a

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cve@mitre.org (Product)
cve@mitre.org (Release Notes)
cve@mitre.org (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2016-20021?: CVE-2016-20021 is a critical-severity vulnerability in Gentoo Portage, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2024-01-12.
How severe is CVE-2016-20021?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2016-20021 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.