{"id":"CVE-2026-20316","published":"2026-07-29T17:16:51Z","modified":"2026-10-24T13:10:00Z","title":"Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability","vendor":"Cisco","product":"Secure Firewall Management Center (FMC)","tier":"core","eol":null,"description":{"text":"A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems.\r\n\r\nThis vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user. \r\nNote: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.  \r\nCisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges.","provenance":"source","from":"NVD"},"summary":{"text":"A hard-coded static password for a low-privileged account in the web interface of Cisco Secure Firewall Management Center (FMC) Software allows unauthenticated remote access to the affected system. An attacker who logs in with these static credentials can access sensitive data as that low-privileged user, with no user interaction required; exposure is reduced if the FMC management interface lacks public internet access.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:03:04Z"},"cvss":{"score":5.3,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.35096,"percentile":0.98435,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-07-29","dueDate":"2026-08-01","ransomware":true,"requiredAction":"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.","notes":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-static-cred-BET3Cjh ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20316","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-07-29","exploitedFirstSeen":"2026-07-29","ransomware":true,"evidence":[{"url":"https://previdian.com/CVE-2026-20316","date":"2026-07-29"},{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-static-cred-BET3Cjh","date":"2026-07-29"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-07-29"},{"url":"https://x.com/Horizon3ai/status/2083303075666600261#m","date":"2026-07-31"},{"url":"https://blackpointcyber.com/blog/blackpoint-soc-threat-pulse-week-of-august-3-2026/","date":"2026-08-04"},{"url":"https://cydome.io/maritime-cybersecurity-bulletin-august-7th-2026/","date":"2026-08-07"},{"url":"https://www.recordedfuture.com/blog/july-2026-cve-landscape","date":"2026-08-07"},{"url":"https://blog.talosintelligence.com/fmc-ongoing-exploitation/","date":"2026-09-09"},{"url":"https://cydome.io/maritime-cybersecurity-bulletin-september-11th-2026/","date":"2026-09-11"},{"url":"https://asec.ahnlab.com/en/95733/","date":"2026-10-07"}],"evidenceTotal":12,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"}],"provenance":"machine"},"cwes":[{"id":"CWE-259","name":"Use of Hard-coded Password"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-static-cred-BET3Cjh","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20316","tags":["US Government Resource"]}],"techniques":[{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Static hard-coded credentials used to log in","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"This vulnerability is due to the presence of static user credentials for a low-privileged","start":263,"end":352}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1005","name":"Data from Local System","tactics":["collection"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Attacker accesses sensitive data on system","mappingType":"primary_impact","evidence":[{"from":"description","quote":"access sensitive data as the low-privileged user","start":549,"end":597}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-4cf3172d190519e868ee","title":"Blog | Arctic Wolf","publisher":"arcticwolf.com","url":"https://arcticwolf.com/resources/blog/","date":null,"mentions":[{"quote":"CVE-2026-20316, CVE-2026-20079: Active Exploitation of Cisco Secure Firewall Management Center Zero-Day","start":9292,"end":9395}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-50404","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-50404","exploited":true,"exploitedSince":"2026-07-29","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1078"],"provenance":"ai"},{"stage":"primary","techniques":["T1005"],"provenance":"ai"}],"timeline":[{"date":"2026-07-29","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20316","provenance":"source"},{"date":"2026-07-29","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://previdian.com/CVE-2026-20316","provenance":"source"},{"date":"2026-07-29","kind":"kev","label":"Added to CISA KEV (known ransomware use)","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-07-29","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-50404","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":0},"priority":{"score":80.3,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 94 days ago"},{"name":"Known ransomware use","points":10.0,"detail":"CISA KEV and VulnCheck KEV: Known"},{"name":"EPSS percentile","points":19.69,"detail":"percentile 0.9843"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":3.71,"detail":"base score 5.3"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}