{"id":"CVE-2020-35729","aliases":["EUVD-2020-23385","GHSA-w4v7-6457-x826"],"status":"published","title":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions...","description":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.88099,"percentile":0.99768,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-78"],"published":"2020-12-27T04:40:44Z","modified":"2026-06-17T03:14:12Z","exploits":[{"source":"metasploit","id":"exploit/linux/http/klog_server_authenticate_user_unauth_command_injection","title":"Klog Server authenticate.php user Unauthenticated Command Injection","type":"exploit","platform":"Linux,Unix","date":"2020-12-27","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/linux/http/klog_server_authenticate_user_unauth_command_injection"},{"source":"exploitdb","id":"EDB-49366","title":"Klog Server 2.4.1 - Command Injection (Unauthenticated)","type":"webapps","platform":"php","date":"2021-01-05","verified":true,"url":"https://www.exploit-db.com/exploits/49366"},{"source":"exploitdb","id":"EDB-49474","title":"Klog Server 2.4.1 - Unauthenticated Command Injection (Metasploit)","type":"webapps","platform":"php","date":"2021-01-25","verified":true,"url":"https://www.exploit-db.com/exploits/49474"},{"source":"pocgithub","id":"Al1ex/CVE-2020-35729","title":"Al1ex/CVE-2020-35729","date":"2021-04-09","url":"https://github.com/Al1ex/CVE-2020-35729"},{"source":"nuclei","id":"CVE-2020-35729","title":"Klog Server \u003c=2.41 - Unauthenticated Command Injection","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-35729.yaml"}],"products":[{"vendor":"klogserver","product":"klog_server"}],"references":[{"url":"https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.md","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_Code","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/160798/Klog-Server-2.4.1-Command-Injection.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/161123/Klog-Server-2.4.1-Command-Injection.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/161410/Klog-Server-2.4.1-Command-Injection.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-35729"},{"url":"https://github.com/advisories/GHSA-w4v7-6457-x826"}],"sources":{"cve":[{"id":"CVE-2020-35729","description":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.","status":"published","published":"2020-12-27T04:40:44Z","modified":"2024-08-04T17:09:15.252Z","updated_at":"2026-11-02T14:35:57.975444Z"}],"euvd":[{"id":"EUVD-2020-23385","description":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.","status":"published","published":"2020-12-27T04:40:44Z","modified":"2024-08-04T17:09:15Z","updated_at":"2026-11-03T03:07:05.848444Z"}],"ghsa":[{"id":"GHSA-w4v7-6457-x826","title":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions...","description":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.","status":"published","published":"2022-05-24T17:37:28Z","modified":"2023-01-29T05:05:11Z","cwes":["CWE-78"],"updated_at":"2026-11-02T14:45:43.934947Z"}],"nvd":[{"id":"CVE-2020-35729","description":"KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.","status":"published","published":"2020-12-27T05:15:11.683Z","modified":"2026-06-17T03:14:12.143Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:06:28.340168Z"}]}}