Description
telnetd in Heimdal 0.6.x before 0.6.6 and 0.7.x before 0.7.2 allows remote unauthenticated attackers to cause a denial of service (server crash) via unknown vectors that trigger a null dereference.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | heimdal | 0.7.2-1 | — |
| Debian 13 | heimdal | 0.7.2-1 | — |
| Debian 12 | heimdal | 0.7.2-1 | — |
| Debian 3.1 | heimdal | 0.6.3-10sarge2 | DSA-977-1 |
Advisories 1
- DSA-977-1 heimdal - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- 18894 third-party-advisory
- 19005 third-party-advisory
- ADV-2006-0653 vdb-entry
- ADV-2006-0456 vdb-entry
- USN-253-1 vendor-advisory
- 18961 third-party-advisory
- heimdal-telnetd-dos(24763) vdb-entry
- 449 third-party-advisory
- 16676 vdb-entry
- DSA-977 vendor-advisory
- 23244 vdb-entry
- ADV-2006-0628 vdb-entry
- SUSE-SA:2006:011 vendor-advisory
- [heimdal-discuss] 20060206 Heimdal 0.7.2 and 0.6.6 mailing-list