| Package | Affected versions | Patched versions |
|---|---|---|
| firebox pptp vpn | = 4.9= 5.0 |
The PPTP VPN service in Watchguard Firebox before 10, when performing the MS-CHAPv2 authentication handshake, generates different error codes depending on whether the username is valid or invalid, which allows remote attackers to enumerate valid usernames.
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