libpurple in Pidgin before 2.2.1 does not properly handle MSN nudge messages from users who are not on the receivers buddy list, which allows remote attackers to cause a denial of service (crash) via a nudge message that triggers an access of an invalid memory location.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pidgin | Pidgin | 2.2.0 (including) | 2.2.0 (including) |
| Pidgin | Ubuntu | upstream | * |