VIR Vulnerability Intelligence Relay

CVE-2016-2056

high
Published 2016-04-13 · Modified 2026-05-06
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
8.8
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4 NEW
—
not yet in upstream
VIR risk
9.8

Description

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.

Predictions

Exploit likelihood
92%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-47114 remote multiple verified
Metasploit · 2019-07-12

Xymon 4.3.25 - useradm Command Execution (Metasploit)

Source code queued for fetch — refresh in a moment.

Metasploit modules

exploit_unix/webapp/xymon_useradm_cmd_exec rank 600
Xymon useradm Command Execution
Source fetch failed: fetch_error — view the original via the link above.

OS impact
debian Debian Mixed 6 releases
VersionStatusFixed in
trixie Fixed 4.3.25-1
sid Fixed 4.3.25-1
forky Fixed 4.3.25-1
bullseye Fixed 4.3.25-1
bookworm Fixed 4.3.25-1
8.0 Affected —

Application impact
VendorProductVersionsFixed
xymonxymon4.1.0
xymonxymon4.1.1
xymonxymon4.1.2
xymonxymon4.2
xymonxymon4.2.0
xymonxymon4.2.2
xymonxymon4.2.3
xymonxymon4.3.0
xymonxymon4.3.1
xymonxymon4.3.2
xymonxymon4.3.3
xymonxymon4.3.4
xymonxymon4.3.5
xymonxymon4.3.6
xymonxymon4.3.7
xymonxymon4.3.8
xymonxymon4.3.9
xymonxymon4.3.10
xymonxymon4.3.11
xymonxymon4.3.12
xymonxymon4.3.13
xymonxymon4.3.14
xymonxymon4.3.15
xymonxymon4.3.16
xymonxymon4.3.17
xymonxymon4.3.18
xymonxymon4.3.19
xymonxymon4.3.20
xymonxymon4.3.21
xymonxymon4.3.22
xymonxymon4.3.23
xymonxymon4.3.24

References

CWEs

CWE-77

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.