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Vulnerability DatabaseCVE-2021-20212

CVE-2021-20212: 
Privoxy vulnerability analysis and mitigation

Overview

A memory leak vulnerability was discovered in Privoxy versions before 3.0.29. The vulnerability occurs when multiple filters are executed and the last one is skipped due to a PCRE (Perl Compatible Regular Expressions) error (Privoxy Manual, RedHat Bugzilla).

Technical details

The vulnerability is identified as CVE-2021-20212 and affects the filter execution mechanism in Privoxy. When multiple filters are processed and the last filter encounters a PCRE error, the system fails to properly free allocated memory, resulting in a memory leak condition (Privoxy Manual).

Impact

The memory leak can lead to system resource depletion and potentially result in a system crash, affecting the availability of the Privoxy service (RedHat Bugzilla, Gentoo Security).

Exploitability

The vulnerability requires the execution of multiple filters with specific conditions involving PCRE errors. No known exploits in the wild have been reported (RedHat Bugzilla).

Mitigation and workarounds

The vulnerability has been fixed in Privoxy version 3.0.29 and later. Users are advised to upgrade to the latest version. The fix was implemented through commit 5cfb7bc8fe (Privoxy Manual, Ubuntu Security).

Additional resources

Source: This report was generated using AI

Related Privoxy vulnerabilities:

CVE ID

Severity

Score

Technologies

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Published date

CVE-2021-44542HIGH7.5
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NoYesDec 23, 2021
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CVE-2021-20209HIGH7.5
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CVE-2021-44543MEDIUM6.1
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