{"id":"CVE-2016-2056","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-2056","generatedAt":"2026-11-05T05:31:23.567Z","title":"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.","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.","published":"2016-04-13T16:59:07.000Z","lastModified":"2026-06-17T00:43:21.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":8.8,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-77"],"affected":["xymon/xymon","debian/debian linux"],"epss":{"score":0.54507,"percentile":0.99019,"date":"2026-11-04","history":[{"date":"2026-09-21","score":0.53102,"percentile":0.98958},{"date":"2026-09-22","score":0.54507,"percentile":0.98967}]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2019-07-12","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":47114,"kind":"exploit","title":"Xymon 4.3.25 - useradm Command Execution (Metasploit)","url":"https://www.exploit-db.com/exploits/47114","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/remote/47114.rb","file":"exploits/multiple/remote/47114.rb","published":"2019-07-12","added":"2019-07-12","updated":"2019-07-12","author":"Metasploit","type":"remote","platform":"multiple","port":null,"verified":true,"codes":["CVE-2016-2056"],"tags":"Metasploit Framework (MSF)","aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/xymon_useradm_cmd_exec.rb"}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 54.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/135758/Xymon-4.3.x-Buffer-Overflow-Code-Execution-Information-Disclosure.html","source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/153620/Xymon-useradm-Command-Execution.html","source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2016/dsa-3495","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/537522/100/0/threaded","source":"cve@mitre.org"},{"url":"https://sourceforge.net/p/xymon/code/7892/","tags":["Patch"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/135758/Xymon-4.3.x-Buffer-Overflow-Code-Execution-Information-Disclosure.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/153620/Xymon-useradm-Command-Execution.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2016/dsa-3495","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/537522/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceforge.net/p/xymon/code/7892/","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-2056","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}