--- id: CVE-2026-20079 title: >- 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 … summary: >- 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 … severity: critical cvss: 10 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H' cwe: - CWE-288 vendor: cisco product: secure_firewall_management_center affected: - secure_firewall_management_center = 7.0.0 - secure_firewall_management_center = 7.0.0.1 - secure_firewall_management_center = 7.0.1 - secure_firewall_management_center = 7.0.1.1 - secure_firewall_management_center = 7.0.2 - secure_firewall_management_center = 7.0.2.1 - secure_firewall_management_center = 7.0.3 - secure_firewall_management_center = 7.0.4 - secure_firewall_management_center = 7.0.5 - secure_firewall_management_center = 7.0.6 - secure_firewall_management_center = 7.0.6.1 - secure_firewall_management_center = 7.0.6.2 - secure_firewall_management_center = 7.0.6.3 - secure_firewall_management_center = 7.0.7 - secure_firewall_management_center = 7.0.8 - secure_firewall_management_center = 7.0.8.1 - secure_firewall_management_center = 7.0.9 - secure_firewall_management_center = 7.1.0 - secure_firewall_management_center = 7.1.0.1 - secure_firewall_management_center = 7.1.0.2 - secure_firewall_management_center = 7.1.0.3 - secure_firewall_management_center = 7.2.0 - secure_firewall_management_center = 7.2.0.1 - secure_firewall_management_center = 7.2.1 - secure_firewall_management_center = 7.2.2 - secure_firewall_management_center = 7.2.3 - secure_firewall_management_center = 7.2.3.1 - secure_firewall_management_center = 7.2.4 - secure_firewall_management_center = 7.2.4.1 - secure_firewall_management_center = 7.2.5 - secure_firewall_management_center = 7.2.5.1 - secure_firewall_management_center = 7.2.5.2 - secure_firewall_management_center = 7.2.6 - secure_firewall_management_center = 7.2.7 - secure_firewall_management_center = 7.2.8 - secure_firewall_management_center = 7.2.8.1 - secure_firewall_management_center = 7.2.9 - secure_firewall_management_center = 7.2.10 - secure_firewall_management_center = 7.2.10.1 - secure_firewall_management_center = 7.2.10.2 - secure_firewall_management_center = 7.2.11 - secure_firewall_management_center = 7.3.0 - secure_firewall_management_center = 7.3.1 - secure_firewall_management_center = 7.3.1.1 - secure_firewall_management_center = 7.3.1.2 - secure_firewall_management_center = 7.4.0 - secure_firewall_management_center = 7.4.1 - secure_firewall_management_center = 7.4.1.1 - secure_firewall_management_center = 7.4.2 - secure_firewall_management_center = 7.4.2.1 - secure_firewall_management_center = 7.4.2.2 - secure_firewall_management_center = 7.4.2.3 - secure_firewall_management_center = 7.4.2.4 - secure_firewall_management_center = 7.4.3 - secure_firewall_management_center = 7.4.4 - secure_firewall_management_center = 7.4.5 - secure_firewall_management_center = 7.4.6 - secure_firewall_management_center = 7.4.7 - secure_firewall_management_center = 7.6.0 - secure_firewall_management_center = 7.6.1 - secure_firewall_management_center = 7.6.2 - secure_firewall_management_center = 7.6.2.1 - secure_firewall_management_center = 7.6.3 - secure_firewall_management_center = 7.6.4 - secure_firewall_management_center = 7.6.5 - secure_firewall_management_center = 7.7.0 - secure_firewall_management_center = 7.7.10 - secure_firewall_management_center = 7.7.10.1 - secure_firewall_management_center = 7.7.11 - secure_firewall_management_center = 7.7.12 - secure_firewall_management_center = 10.0.0 - secure_firewall_management_center = 10.0.1 published: '2026-03-04' updated: '2026-09-16' sourceUpdated: '2026-09-16T17:17:16.340' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20079' references: - url: >- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2 label: psirt@cisco.com - url: 'http://seclists.org/fulldisclosure/2026/Aug/80' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://blog.talosintelligence.com/fmc-ongoing-exploitation/' label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20079 label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: 'https://software.cisco.com' tags: - nvd - kev - in-the-wild - exploit-available - cve.org - csaf - vendor-advisory - cisco epss: 0.75752 epssPercentile: 0.995 kev: true kevDateAdded: '2026-09-09' kevDueDate: '2026-09-12' kevRansomware: false exploited: true exploits: github: 3 githubRepos: - 'https://github.com/CyberAuth/CVE-2026-20079' - 'https://github.com/0xBlackash/CVE-2026-20079' - 'https://github.com/DiegoArias008/CVE-2026-20079-checker' metasploit: - exploit/linux/http/cisco_fmc_auth_bypass_rce nuclei: - CVE-2026-20079 checkedAt: '2026-09-24T07:53:00.399Z' exploitAvailable: true ssvc: exploitation: active automatable: 'yes' technicalImpact: total timestamp: '2026-09-10T03:55:16.679381Z' ingestedAt: '2026-07-29T17:48:48.974Z' --- ## Overview 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.  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.  ## Affected - `secure_firewall_management_center = 7.0.0` - `secure_firewall_management_center = 7.0.0.1` - `secure_firewall_management_center = 7.0.1` - `secure_firewall_management_center = 7.0.1.1` - `secure_firewall_management_center = 7.0.2` - `secure_firewall_management_center = 7.0.2.1` - `secure_firewall_management_center = 7.0.3` - `secure_firewall_management_center = 7.0.4` - `secure_firewall_management_center = 7.0.5` - `secure_firewall_management_center = 7.0.6` - `secure_firewall_management_center = 7.0.6.1` - `secure_firewall_management_center = 7.0.6.2` - `secure_firewall_management_center = 7.0.6.3` - `secure_firewall_management_center = 7.0.7` - `secure_firewall_management_center = 7.0.8` - `secure_firewall_management_center = 7.0.8.1` - `secure_firewall_management_center = 7.0.9` - `secure_firewall_management_center = 7.1.0` - `secure_firewall_management_center = 7.1.0.1` - `secure_firewall_management_center = 7.1.0.2` - `secure_firewall_management_center = 7.1.0.3` - `secure_firewall_management_center = 7.2.0` - `secure_firewall_management_center = 7.2.0.1` - `secure_firewall_management_center = 7.2.1` - `secure_firewall_management_center = 7.2.2` - `secure_firewall_management_center = 7.2.3` - `secure_firewall_management_center = 7.2.3.1` - `secure_firewall_management_center = 7.2.4` - `secure_firewall_management_center = 7.2.4.1` - `secure_firewall_management_center = 7.2.5` - `secure_firewall_management_center = 7.2.5.1` - `secure_firewall_management_center = 7.2.5.2` - `secure_firewall_management_center = 7.2.6` - `secure_firewall_management_center = 7.2.7` - `secure_firewall_management_center = 7.2.8` - `secure_firewall_management_center = 7.2.8.1` - `secure_firewall_management_center = 7.2.9` - `secure_firewall_management_center = 7.2.10` - `secure_firewall_management_center = 7.2.10.1` - `secure_firewall_management_center = 7.2.10.2` - `secure_firewall_management_center = 7.2.11` - `secure_firewall_management_center = 7.3.0` - `secure_firewall_management_center = 7.3.1` - `secure_firewall_management_center = 7.3.1.1` - `secure_firewall_management_center = 7.3.1.2` - `secure_firewall_management_center = 7.4.0` - `secure_firewall_management_center = 7.4.1` - `secure_firewall_management_center = 7.4.1.1` - `secure_firewall_management_center = 7.4.2` - `secure_firewall_management_center = 7.4.2.1` - `secure_firewall_management_center = 7.4.2.2` - `secure_firewall_management_center = 7.4.2.3` - `secure_firewall_management_center = 7.4.2.4` - `secure_firewall_management_center = 7.4.3` - `secure_firewall_management_center = 7.4.4` - `secure_firewall_management_center = 7.4.5` - `secure_firewall_management_center = 7.4.6` - `secure_firewall_management_center = 7.4.7` - `secure_firewall_management_center = 7.6.0` - `secure_firewall_management_center = 7.6.1` - `secure_firewall_management_center = 7.6.2` - `secure_firewall_management_center = 7.6.2.1` - `secure_firewall_management_center = 7.6.3` - `secure_firewall_management_center = 7.6.4` - `secure_firewall_management_center = 7.6.5` - `secure_firewall_management_center = 7.7.0` - `secure_firewall_management_center = 7.7.10` - `secure_firewall_management_center = 7.7.10.1` - `secure_firewall_management_center = 7.7.11` - `secure_firewall_management_center = 7.7.12` - `secure_firewall_management_center = 10.0.0` - `secure_firewall_management_center = 10.0.1` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **cisco-sa-onprem-fmc-authbypass-5JPp45V2** · Cisco · affected: Cisco Secure Firewall Management Center (FMC) Appliances · updated 2026-09-16 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2)