CVE-2009-4630

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2010-01-29 · updated 2026-06-16
Weakness: CWE-200

Description

Mozilla Necko, as used in Firefox, SeaMonkey, and other applications, performs DNS prefetching of domain names contained in links within local HTML documents, which makes it easier for remote attackers to determine the network location of the application's user by logging DNS requests. NOTE: the vendor disputes the significance of this issue, stating "I don't think we necessarily need to worry about that case."

Affected products

Mozilla Firefox: all versions
Mozilla Seamonkey: all versions
Mozilla Thunderbird: all versions

References

https://bugzilla.mozilla.org/show_bug.cgi?id=453403
https://bugzilla.mozilla.org/show_bug.cgi?id=492196
https://bugzilla.mozilla.org/show_bug.cgi?id=453403
https://bugzilla.mozilla.org/show_bug.cgi?id=492196

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