It was found in FreeBSD 8.0, 6.3 and 4.9, and OpenBSD 4.6 that a null pointer dereference in ftpd/popen.c may lead to remote denial of service of the ftpd service.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openbsd | Openbsd | 4.6 | 4.6 |
| Openbsd | Openbsd | 6.3 | 6.3 |
| Openbsd | Openbsd | 4.9 | 4.9 |
| Openbsd | Openbsd | 8.0 | 8.0 |