What’s Vulnerable › Vulnerabilities

CVE-2021-44543

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-23 · updated 2026-06-17
• Weakness: CWE-79

Description

An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode the template name when Privoxy is configured to servce the user-manual itself.

Affected products

• privoxy: before 3.0.33 — fixed in 3.0.33

How to fix

Upgrade to a fixed version: privoxy 3.0.33. Check the vendor advisory for mitigations.

References

• https://www.privoxy.org/3.0.33/user-manual/whatsnew.html%2C
• https://www.privoxy.org/gitweb/?p=privoxy.git%3Ba=commit%3Bh=0e668e9409c
• https://www.privoxy.org/3.0.33/user-manual/whatsnew.html%2C
• https://www.privoxy.org/gitweb/?p=privoxy.git%3Ba=commit%3Bh=0e668e9409c

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