CVE-2010-2764: Mozilla Firefox before 3.5.12 and 3.6.x before 3.6.9, Thunderbird before 3.0.7 and 3.1.x before 3.1.3, and...

Security readout for executives and security teams

This old Mozilla flaw could let a malicious website infer whether internal web servers exist when visited from a vulnerable browser or mail client. It is not described as code execution, but it can expose internal network information useful for reconnaissance. Exposure is mainly legacy Mozilla clients: Firefox before 3.5.12 or 3.6.9, Thunderbird before 3.0.7 or 3.1.3, and SeaMonkey before 2.0.7. Modern supported versions should not be affected based on the provided sources. Treat this as a legacy exposure cleanup item unless vulnerable clients remain in use. It is most concerning where old browsers or mail clients can access both the internet and sensitive internal web services. Mitigation focus: Upgrade affected Mozilla products to fixed or later supported versions.; Remove unsupported Firefox, Thunderbird, and SeaMonkey builds from managed endpoints.; Check OS vendor advisories for backported package fixes..

Prepared

Jun 28, 2026, 01:40 UTC (UTC+00:00)

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