CVE-2013-2503: Privoxy before 3.0.21 does not properly handle Proxy-Authenticate and Proxy-Authorization headers in the cl...

Security readout for executives and security teams

Older Privoxy versions could be tricked by a remote website into asking for proxy credentials as if it were the real proxy. That creates a risk that proxy usernames and passwords are disclosed to an untrusted server. Exposure is limited to environments using Privoxy versions before 3.0.21, especially where users authenticate to a proxy while browsing HTTP sites through Privoxy. Treat as a targeted credential-exposure risk for legacy Privoxy deployments, not a broad emergency. Prioritize remediation where proxy credentials protect internal or sensitive network access. Mitigation focus: Upgrade Privoxy to 3.0.21 or later through trusted vendor packages.; Apply distribution security updates, including relevant openSUSE guidance where applicable.; Avoid proxy-authenticated browsing through vulnerable Privoxy until upgraded..

Prepared

Jun 24, 2026, 11:46 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.