{"id":"CVE-2018-18556","aliases":["EUVD-2018-10276","GHSA-8jmm-6g59-87gc"],"status":"published","title":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows...","description":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.","severity":{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.15411,"percentile":0.9681,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"2018-12-17T18:00:00Z","modified":"2026-06-17T01:47:29Z","exploits":[{"source":"metasploit","id":"exploit/linux/ssh/vyos_restricted_shell_privesc","title":"VyOS restricted-shell Escape and Privilege Escalation","type":"exploit","platform":"Unix","date":"2018-11-05","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/linux/ssh/vyos_restricted_shell_privesc"}],"products":[{"vendor":"vyos","product":"vyos"}],"references":[{"url":"https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory"]},{"url":"https://blog.mirch.io/2018/11/05/cve-2018-18556-vyos-privilege-escalation-via-sudo-pppd-for-operator-users/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/159234/VyOS-restricted-shell-Escape-Privilege-Escalation.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-18556"},{"url":"https://github.com/advisories/GHSA-8jmm-6g59-87gc"}],"sources":{"cve":[{"id":"CVE-2018-18556","description":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.","status":"published","published":"2018-12-17T18:00:00Z","modified":"2024-08-05T11:15:59.672Z","updated_at":"2026-11-02T14:35:11.426178Z"}],"euvd":[{"id":"EUVD-2018-10276","description":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.","status":"published","published":"2018-12-17T18:00:00Z","modified":"2024-08-05T11:15:59Z","updated_at":"2026-11-03T02:39:35.790696Z"}],"ghsa":[{"id":"GHSA-8jmm-6g59-87gc","title":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows...","description":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.","status":"published","published":"2022-05-13T01:16:08Z","modified":"2023-01-28T05:05:53Z","cvss":[{"version":"3.0","score":9.9,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T14:44:22.854564Z"}],"nvd":[{"id":"CVE-2018-18556","description":"A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.","status":"published","published":"2018-12-17T19:29:00.627Z","modified":"2026-06-17T01:47:29.84Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":9,"vector":"AV:N/AC:L/Au:S/C:C/I:C/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:04:50.99633Z"}]}}