What’s Vulnerable › Vulnerabilities

CVE-2021-20212

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% 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-401

Description

A flaw was found in Privoxy in versions before 3.0.29. Memory leak if multiple filters are executed and the last one is skipped due to a pcre error leading to a system crash.

Affected products

• privoxy: before 3.0.29 — fixed in 3.0.29

How to fix

Upgrade to a fixed version: privoxy 3.0.29. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1928736
• https://security.gentoo.org/glsa/202107-16
• https://www.privoxy.org/3.0.29/user-manual/whatsnew.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1928736
• https://security.gentoo.org/glsa/202107-16
• https://www.privoxy.org/3.0.29/user-manual/whatsnew.html

Get alerted when CVE-2021-20212 or the next vulnerability affects your stack