CVE-2019-13455
In Xymon through 4.3.28, a stack-based buffer overflow vulnerability exists in the alert acknowledgment CGI tool because of expansion in acknowledge.c.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.99%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In Xymon through 4.3.28, a stack-based buffer overflow vulnerability exists in the alert acknowledgment CGI tool because of expansion in acknowledge.c.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.99% probability · 81th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- xymon/xymon · debian/debian linux
- Source
- cve@mitre.org
EPSS 2.0% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/svn2github/xymon/blob/master/branches/4.3.28/web/acknowledge.cThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00032.htmlMailing List, Third Party Advisory
- https://lists.xymon.com/archive/2019-July/046570.htmlExploit, Mailing List, Vendor Advisory
- https://github.com/svn2github/xymon/blob/master/branches/4.3.28/web/acknowledge.cThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00032.htmlMailing List, Third Party Advisory
- https://lists.xymon.com/archive/2019-July/046570.htmlExploit, Mailing List, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.