CVE-2009-4629: Mozilla Seamonkey

Medium severity, CVSS 5.0. EPSS: 0.9% chance of exploitation in the next 30 days.

Mozilla Necko, as used in Thunderbird 3.0.1, SeaMonkey, and other applications, performs DNS prefetching even when the app type is APP_TYPE_MAIL or APP_TYPE_EDITOR, which makes it easier for remote attackers to determine the network location of the application's user by logging DNS requests, as demonstrated by DNS requests triggered by reading text/plain e-mail messages in Thunderbird.

Affected products

• Mozilla Seamonkey: any version
• Mozilla Thunderbird: version 3.0.1 only

Published 2010-01-29. Last modified 2026-06-16.