GnuTLS before 2.9.10 does not verify the activation and expiration dates of CA certificates, which allows man-in-the-middle attackers to spoof servers via a certificate issued by a CA certificate that is (1) not yet valid or (2) no longer valid.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Gnutls | Gnu | * | 2.9.9 (including) |
| Red Hat Enterprise Linux 6 | RedHat | gnutls-0:2.8.5-18.el6 | * |
| Gnutls26 | Ubuntu | lucid | * |
| Gnutls26 | Ubuntu | upstream | * |