The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.
2011-08-29T17:55:00.957
2025-04-11T00:51:21.963
Deferred
CVSSv2: 4.3 (MEDIUM)
AV:N/AC:M/Au:N/C:N/I:N/A:P
8.6
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | pidgin | libpurple | 2.8.0 | Yes |
| Application | pidgin | libpurple | 2.9.0 | Yes |
| Application | pidgin | pidgin | ≤ 2.9.0 | Yes |
| Application | pidgin | pidgin | 2.0.0 | Yes |
| Application | pidgin | pidgin | 2.0.1 | Yes |
| Application | pidgin | pidgin | 2.0.2 | Yes |
| Application | pidgin | pidgin | 2.1.0 | Yes |
| Application | pidgin | pidgin | 2.1.1 | Yes |
| Application | pidgin | pidgin | 2.2.0 | Yes |
| Application | pidgin | pidgin | 2.2.1 | Yes |
| Application | pidgin | pidgin | 2.2.2 | Yes |
| Application | pidgin | pidgin | 2.3.0 | Yes |
| Application | pidgin | pidgin | 2.3.1 | Yes |
| Application | pidgin | pidgin | 2.4.0 | Yes |
| Application | pidgin | pidgin | 2.4.1 | Yes |
| Application | pidgin | pidgin | 2.4.2 | Yes |
| Application | pidgin | pidgin | 2.4.3 | Yes |
| Application | pidgin | pidgin | 2.5.0 | Yes |
| Application | pidgin | pidgin | 2.5.1 | Yes |
| Application | pidgin | pidgin | 2.5.2 | Yes |
| Application | pidgin | pidgin | 2.5.3 | Yes |
| Application | pidgin | pidgin | 2.5.4 | Yes |
| Application | pidgin | pidgin | 2.5.5 | Yes |
| Application | pidgin | pidgin | 2.5.6 | Yes |
| Application | pidgin | pidgin | 2.5.7 | Yes |
| Application | pidgin | pidgin | 2.5.8 | Yes |
| Application | pidgin | pidgin | 2.5.9 | Yes |
| Application | pidgin | pidgin | 2.6.0 | Yes |
| Application | pidgin | pidgin | 2.6.1 | Yes |
| Application | pidgin | pidgin | 2.6.2 | Yes |
| Application | pidgin | pidgin | 2.6.4 | Yes |
| Application | pidgin | pidgin | 2.6.5 | Yes |
| Application | pidgin | pidgin | 2.6.6 | Yes |
| Application | pidgin | pidgin | 2.7.0 | Yes |
| Application | pidgin | pidgin | 2.7.1 | Yes |
| Application | pidgin | pidgin | 2.7.2 | Yes |
| Application | pidgin | pidgin | 2.7.3 | Yes |
| Application | pidgin | pidgin | 2.7.4 | Yes |
| Application | pidgin | pidgin | 2.7.5 | Yes |
| Application | pidgin | pidgin | 2.7.6 | Yes |
| Application | pidgin | pidgin | 2.7.7 | Yes |
| Application | pidgin | pidgin | 2.7.8 | Yes |
| Application | pidgin | pidgin | 2.7.9 | Yes |
| Application | pidgin | pidgin | 2.7.10 | Yes |
| Application | pidgin | pidgin | 2.7.11 | Yes |
| Application | pidgin | pidgin | 2.8.0 | Yes |