CVE-2016-2056 Command injection in n/a

What is CVE-2016-2056?

CVE-2016-2056 is a high-severity command injection vulnerability in Debian Debian Linux, published on 13 Apr 2016. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-77

Which versions are affected by CVE-2016-2056?

It affects 2 products.

Products include Debian Debian Linux, Xymon Xymon.

How do I fix CVE-2016-2056?

Upgrade to a fixed version.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2016-2056 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-2056 exists.

Public exploit code: 1 Metasploit module and 1 Exploit-DB entry.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2016-2056, GHSA-9xfv-r389-8vvf.