Description
Multiple buffer overflows in xymond/xymond.c in xymond in Xymon 4.1.x, 4.2.x, and 4.3.x before 4.3.25 allow remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a long filename, involving handling a "config" command.
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 | xymon | 4.3.25-1 | — |
| Debian 13 | xymon | 4.3.25-1 | — |
| Debian 12 | xymon | 4.3.25-1 | — |
| Debian 8 | xymon | 4.3.17-6+deb8u1 | DSA-3495-1 |
| Debian 7 | xymon | 4.3.0~beta2.dfsg-9.1+deb7u1 | DLA-488-1 |
Advisories 2
- DLA-488-1 xymon - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3495-1 xymon - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://sourceforge.net/p/xymon/code/7859/
- 20160214 Xymon: Critical security issues in all versions prior to 4.3.25 mailing-list
- DSA-3495 vendor-advisory
- [Xymon] 20160208 Xymon 4.3.25 - Important Security Update mailing-list
- https://sourceforge.net/p/xymon/code/7860/
- http://packetstormsecurity.com/files/135758/Xymon-4.3.x-Buffer-Overflow-Code-Execution-Information-Disclosure.html