{"id":"CVE-2021-3317","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-3317","generatedAt":"2026-10-27T23:28:31.209Z","title":"KLog Server through 2.4.1 allows authenticated command injection. async.php calls shell_exec() on the original value of the source parameter.","description":"KLog Server through 2.4.1 allows authenticated command injection. async.php calls shell_exec() on the original value of the source parameter.","published":"2021-01-26T23:15:13.000Z","lastModified":"2026-06-17T04:04:56.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-78"],"affected":["klogserver/klog server"],"epss":{"score":0.41394,"percentile":0.98664,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2021-02-01","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":49511,"kind":"exploit","title":"Klog Server 2.4.1 - Command Injection (Authenticated)","url":"https://www.exploit-db.com/exploits/49511","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/webapps/49511.py","file":"exploits/php/webapps/49511.py","published":"2021-02-01","added":"2021-02-01","updated":"2021-02-01","author":"Metin Yunus Kandemir","type":"webapps","platform":"php","port":null,"verified":false,"codes":["CVE-2021-3317"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 41.4%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/161208/Klog-Server-2.4.1-Command-Injection.html","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://docs.unsafe-inline.com/0day/klog-server-authenticated-command-injection","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/161208/Klog-Server-2.4.1-Command-Injection.html","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://docs.unsafe-inline.com/0day/klog-server-authenticated-command-injection","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3317","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."}