9.8

CVE-2016-20021: gentoo portage

CVSS: 9.8v3.1CriticalModified
AliasesGHSA-pw5x-x5jw-ccmhPYSEC-2024-10
Published 12-01-2024Last modified 03-06-2025
Open JSON

Vulnerability summary

CVE-2016-20021 is a critical (CVSS 9.8) vulnerability in gentoo portage. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-01-2024
    PublishedVulnerability first disclosed.
  2. 03-06-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

0.00 pp

From 0.47% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.47%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Gentoo1 product
PyPI1 product
  • portage< 3.0.47

2 vendors · 2 products

References

9 links