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.
| Software | From | Fixed in |
|---|---|---|
| mozilla / mozilla | - | 1.7.x |
| mozilla / firefox | - | 0.9.x |
| mozilla / thunderbird | - | 0.7.x |