Nortel Contivity VPN Client 2.1.7, 3.00, 3.01, 4.91, and 5.01, when opening a VPN tunnel, does not check the gateway certificate until after a dialog box has been displayed to the user, which creates a race condition that allows remote attackers to perform a man-in-the-middle (MITM) attack.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Contivity | Nortel | 2.1.7 (including) | 2.1.7 (including) |
| Contivity | Nortel | 3.00 (including) | 3.00 (including) |
| Contivity | Nortel | 3.01 (including) | 3.01 (including) |
| Contivity | Nortel | 4.91 (including) | 4.91 (including) |
| Contivity | Nortel | 5.01 (including) | 5.01 (including) |