CVE-2021-20217

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-25 · updated 2026-06-17
Weakness: CWE-617

Description

A flaw was found in Privoxy in versions before 3.0.31. An assertion failure triggered by a crafted CGI request may lead to denial of service. The highest threat from this vulnerability is to system availability.

Affected products

privoxy: before 3.0.31 — fixed in 3.0.31

How to fix

Upgrade to a fixed version: privoxy 3.0.31. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1923252
https://security.gentoo.org/glsa/202107-16
https://bugzilla.redhat.com/show_bug.cgi?id=1923252
https://security.gentoo.org/glsa/202107-16

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