CVE-2009-2070: Opera Browser

Medium severity, CVSS 6.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Opera displays a cached certificate for a (1) 4xx or (2) 5xx CONNECT response page returned by a proxy server, which allows man-in-the-middle attackers to spoof an arbitrary https site by letting a browser obtain a valid certificate from this site during one request, and then sending the browser a crafted 502 response page upon a subsequent request.

Affected products

• Opera Opera Browser: affected versions not specified

Published 2009-06-15. Last modified 2026-06-16.