🛡️ CVE-2016-20021 — portage

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-347 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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 vulnerable.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2016-20021 is classified as CWE-347: Improper Verification of Cryptographic Signature. A signature is not checked correctly, so forged or modified content is accepted as genuine.

Affected software

CVE-2016-20021 is recorded against 1 package.

  • portage (fixed in 3.0.47)

Timeline and source

Published on 12 January 2024 and last revised on 10 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
bugs.gentoo.org (Web)
github.com (Package)
github.com (Web)
gitweb.gentoo.org (Web)
gitweb.gentoo.org (Web)
wiki.gentoo.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
CWE CWE-347
Public Exploit ✅ No
Source OSV
Published 2024-01-12
Updated 2026-08-12
Modified 2026-06-10

Affected Packages

Software From version Fixed in
portage — 3.0.47

Similar Threats

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