CVE-2003-0870: Opera Browser

High severity, CVSS 7.5. EPSS: 15.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in Opera 7.11 and 7.20 allows remote attackers to execute arbitrary code via an HREF with a large number of escaped characters in the server name.

Affected products

• Opera Opera Browser: version 7.11 only; version 7.20 only

Published 2003-11-17. Last modified 2026-06-16.