CVE-2012-3564: Opera before 12.00 Beta allows remote attackers to cause a denial of service (application hang) via an abso...

Security readout for executives and security teams

This CVE describes an old Opera browser denial-of-service issue. A malicious or malformed web page could make affected Opera versions hang, disrupting the user session. The sources do not indicate data theft, code execution, or active exploitation. Exposure is limited to environments still running Opera versions earlier than 12.00 Beta and using them to browse untrusted content. Modern supported browsers or later Opera builds are not identified as affected in the provided sources. Treat this as low business urgency unless legacy Opera browsers remain in use. It is primarily an availability issue affecting individual browser sessions, not a known enterprise-wide compromise vector in the provided evidence. Mitigation focus: Inventory endpoints for Opera versions earlier than 12.00 Beta.; Upgrade affected Opera clients to 12.00 Beta or a supported current release.; Remove unsupported legacy Opera installations where business use is unnecessary..

Prepared

Jun 24, 2026, 12:34 UTC (UTC+00:00)

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