CVE-2009-0652

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-02-20 · updated 2026-06-16

Description

The Internationalized Domain Names (IDN) blacklist in Mozilla Firefox 3.0.6 and other versions before 3.0.9; Thunderbird before 2.0.0.21; and SeaMonkey before 1.1.15 does not include box-drawing characters, which allows remote attackers to spoof URLs and conduct phishing attacks, as demonstrated by homoglyphs of the / (slash) and ? (question mark) characters in a subdomain of a .cn domain name, a different vulnerability than CVE-2005-0233. NOTE: some third parties claim that 3.0.6 is not affected, but much older versions perhaps are affected.

Affected products

Mozilla Firefox: through 3.0.6; 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5 (+43)
Mozilla Seamonkey: through 1.1.14; 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.5, 1.0.6 (+19)
Mozilla Thunderbird: through 2.0.0.20; 2.0.0.0, 2.0.0.4, 2.0.0.5, 2.0.0.6, 2.0.0.9, 2.0.0.12 (+5)

References

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