What’s Vulnerable › Vulnerabilities

CVE-2004-0765

• Severity: high (CVSS 7.5 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: 2004-08-18 · updated 2026-06-16

Description

The cert_TestHostName function in Mozilla before 1.7, Firefox before 0.9, and Thunderbird before 0.7, only checks the hostname portion of a certificate when the hostname portion of the URI is not a fully qualified domain name (FQDN), which allows remote attackers to spoof trusted certificates.

Affected products

• Mozilla Firefox: through 0.9
• Mozilla: through 1.7
• Mozilla Thunderbird: through 0.7

References

• http://bugzilla.mozilla.org/show_bug.cgi?id=234058
• http://marc.info/?l=bugtraq&m=109900315219363&w=2
• http://www.mozilla.org/projects/security/known-vulnerabilities.html#mozilla1.7
• http://www.novell.com/linux/security/advisories/2004_36_mozilla.html
• http://www.redhat.com/support/errata/RHSA-2004-421.html
• https://exchange.xforce.ibmcloud.com/vulnerabilities/16868
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11162
• http://bugzilla.mozilla.org/show_bug.cgi?id=234058
• http://marc.info/?l=bugtraq&m=109900315219363&w=2
• http://www.mozilla.org/projects/security/known-vulnerabilities.html#mozilla1.7
• http://www.novell.com/linux/security/advisories/2004_36_mozilla.html
• http://www.redhat.com/support/errata/RHSA-2004-421.html

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