Description
Multiple format string vulnerabilities in heartbeat 0.4.9 and earlier (claimed as buffer overflows in some sources) allow remote attackers to execute arbitrary code via certain packets to UDP port 694 (incorrectly claimed as TCP in some sources).
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 | heartbeat | 0.4.9.2-1 | — |
| Debian 13 | heartbeat | 0.4.9.2-1 | — |
| Debian 12 | heartbeat | 0.4.9.2-1 | — |
| Debian 3.0 | heartbeat | 0.4.9.0l-7.2 | DSA-174 |
Advisories 1
- DSA-174 heartbeat - buffer overflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- CLA-2002:540 vendor-advisory
- SuSE-SA:2002:037 vendor-advisory
- DSA-174 vendor-advisory
- linuxha-heartbeat-bo(10357) vdb-entry
- 5955 vdb-entry
- http://linux-ha.org/security/sec01.txt