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CVE-2016-20021

CRITICALCVSS 9.8/10EPSS 0.46%

Last modified

CVE-2016-20021 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.46%

36.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
GentooPortage< 3.0.47

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 vulnerable.
How severe is CVE-2016-20021?
CVE-2016-20021 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.
How do I fix CVE-2016-20021?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-20021?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST