{"id":"CVE-2026-20079","aliases":["EUVD-2026-9438","GHSA-mv8w-c2qv-cgrg"],"status":"published","title":"Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability","description":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.\u0026nbsp;\r\n\r\nThis vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow\u0026nbsp;root access to the device.\u0026nbsp;","severity":{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.88658,"percentile":0.99777,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-288"],"published":"2026-03-04T17:17:35Z","modified":"2026-09-16T20:08:37Z","kev":{"date_added":"2026-09-09","due_date":"2026-09-12","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-09-09"},{"source":"kev","since":"2026-09-09"}],"exploits":[{"source":"metasploit","id":"exploit/linux/http/cisco_fmc_auth_bypass_rce","title":"Cisco Secure Firewall Management Center Authentication Bypass RCE","type":"exploit","platform":"Linux,Unix","date":"2026-03-04","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/linux/http/cisco_fmc_auth_bypass_rce"},{"source":"pocgithub","id":"ashrafzaryouh/CVE-2026-20079","title":"ashrafzaryouh/CVE-2026-20079","date":"2026-03-28","url":"https://github.com/ashrafzaryouh/CVE-2026-20079"},{"source":"pocgithub","id":"CyberAuth/CVE-2026-20079","title":"CyberAuth/CVE-2026-20079","date":"2026-08-17","url":"https://github.com/CyberAuth/CVE-2026-20079"},{"source":"pocgithub","id":"DiegoArias008/CVE-2026-20079-checker","title":"DiegoArias008/CVE-2026-20079-checker","date":"2026-09-13","url":"https://github.com/DiegoArias008/CVE-2026-20079-checker"},{"source":"nuclei","id":"CVE-2026-20079","title":"Cisco Secure Firewall Management Center - Authentication Bypass","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-20079.yaml"}],"products":[{"vendor":"cisco","product":"cisco secure firewall management center (fmc)"},{"vendor":"cisco","product":"secure firewall management center (fmc) and security cloud control (scc) firewall management"},{"vendor":"cisco","product":"secure_firewall_management_center"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2","tags":["Vendor Advisory"]},{"url":"https://blog.talosintelligence.com/fmc-ongoing-exploitation/","tags":["third-party-advisory","Exploit","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20079","tags":["government-resource","US Government Resource"]},{"url":"http://seclists.org/fulldisclosure/2026/Aug/80","tags":["Exploit","Mailing List","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20079"},{"url":"https://blog.talosintelligence.com/fmc-ongoing-exploitation"},{"url":"https://github.com/advisories/GHSA-mv8w-c2qv-cgrg"}],"sources":{"cve":[{"id":"CVE-2026-20079","title":"Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability","description":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.\u0026nbsp;\r\n\r\nThis vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow\u0026nbsp;root access to the device.\u0026nbsp;","status":"published","published":"2026-03-04T17:17:35.838Z","modified":"2026-09-16T20:08:37.499Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T13:35:55.731353Z"}],"euvd":[{"id":"EUVD-2026-9438","description":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.\u0026nbsp;\r\n\r\nThis vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow\u0026nbsp;root access to the device.\u0026nbsp;","status":"published","published":"2026-03-04T17:17:35Z","modified":"2026-09-16T20:08:37Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"exploited_since":"2026-09-09","updated_at":"2026-11-02T17:28:14.33177Z"}],"ghsa":[{"id":"GHSA-mv8w-c2qv-cgrg","title":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software...","description":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.\n\n This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device.","status":"published","published":"2026-03-04T18:31:55Z","modified":"2026-09-09T21:31:33Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T15:11:40.005602Z"}],"kev":[{"id":"CVE-2026-20079","title":"Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability","description":"Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain an authentication Bypass using an alternate path or channel vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.","cwes":["CWE-288"],"kev":{"date_added":"2026-09-09","due_date":"2026-09-12","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-20079","description":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.\u0026nbsp;\r\n\r\nThis vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow\u0026nbsp;root access to the device.\u0026nbsp;","status":"published","published":"2026-03-04T18:16:24.23Z","modified":"2026-09-16T17:17:16.34Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T14:12:07.420927Z"}]}}