The Opera web browser is vulnerable to a heap overflow.
If a user opens a web site containing an HREF tag with multiple escape sequences crafted by a malicious attacker, it could lead to a Denial of Service or the execution of arbitrary code.
Opera Software Opera Web Browser 7.20
Opera Software Opera Web Browser 7.11
System compromise: remote code execution.
Denial of Service.
Apply appropriate patch from the vendor or upgrade to a non-vulnerable version if available.