What’s Vulnerable › Vulnerabilities

CVE-2009-4629

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% 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 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: all versions
• Mozilla Thunderbird: 3.0.1

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=492196
• https://secure.grepular.com/DNS_Prefetch_Exposure_on_Thunderbird_and_Webmail
• https://bugzilla.mozilla.org/show_bug.cgi?id=492196
• https://secure.grepular.com/DNS_Prefetch_Exposure_on_Thunderbird_and_Webmail

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