CVE-2016-2056 in the critical feed json
xymond in Xymon 4.1.x, 4.2.x, and 4.3.x before 4.3.25 allow remote authenticated users to execute arbitrary commands via shell metacharacte…
published 2016-04-13 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3161
- cvss
- 8.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 54.5%
- EPSS 54.5% chance of exploitation in 30 days, percentile 99%
- public exploits
- 2
- Metasploit, Exploit-DB
Summary
xymond in Xymon 4.1.x, 4.2.x, and 4.3.x before 4.3.25 allow remote authenticated users to execute arbitrary commands via shell metacharacters in the adduser_name argument in (1) web/useradm.c or (2) web/chpasswd.c.
Patch / fix
- xymon Debian 14, Debian 13, Debian 12 4.3.25-1
debian advisories DEBIAN-CVE-2016-2056
Timeline
- First public exploit (Metasploit exploit/unix/webapp/xymon_useradm_cmd_exec)
- Published
Exploit prediction
54.51% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- Metasploit exploit/unix/webapp/xymon_useradm_cmd_exec Xymon useradm Command Execution metasploit exploit, excellent rank, 2016-02-14
- EDB-47114 Xymon 4.3.25 - useradm Command Execution (Metasploit) remote, 2019-07-12
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 8.8 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-77 Improper Neutralization of Special Elements used in a Command
References
-
sourceforge.net
/p/xymon/code/7892/
patch
-
debian.org
/security/2016/dsa-3495
vendor-advisory
-
securityfocus.com
/archive/1/537522/100/0/threaded
mailing-list
- packetstormsecurity.com /files/135758/Xymon-4.3.x-Buffer-Overflow-Code-Execution-Information-Disclosure.html
- packetstormsecurity.com /files/153620/Xymon-useradm-Command-Execution.html
Sources
- CVE List CVE-2016-2056
- NVD CVE-2016-2056
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.