CVE-2012-1251: Opera Browser

Medium severity, CVSS 5.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Opera before 9.63 does not properly verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Affected products

• Opera Opera Browser: up to and including 9.62; version 1.00 only; version 2.00 only; version 2.10 only; version 2.12 only; version 3.00 only; …

Published 2012-06-04. Last modified 2026-06-16.