CVE-2009-2063: Opera, possibly before 9.25, processes a 3xx HTTP CONNECT response before a successful SSL handshake, which...

Security readout for executives and security teams

This issue affected legacy Opera browsers handling HTTPS proxy CONNECT responses. A network attacker who could modify traffic might make the browser trust a redirect before the secure handshake completed, letting script run as if it belonged to an HTTPS site. Exposure is mainly legacy client-side: users running old Opera builds through proxy or network paths where CONNECT responses can be manipulated. The supplied sources do not identify precise affected versions, CPEs, or server-side exposure. Treat this as a legacy-browser hygiene issue unless old Opera is still present. Business urgency rises if unmanaged browsers or intercepting proxies exist on sensitive networks. Mitigation focus: Inventory endpoints for legacy Opera installations, especially versions around or before 9.25.; Replace unsupported Opera builds with a current managed browser or vendor-confirmed fixed Opera version.; Check archived vendor guidance before asserting an exact fixed version..

Prepared

Jun 28, 2026, 10:45 UTC (UTC+00:00)

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