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CVE-2026-20131

A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could al
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f1e923a381102617d83a58628d3db5d99ef83a9c3d356039e1ed6ccd15ac7f5a
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unknown","product":"Cisco Secure Firewall Management Center (FMC)","vendor":"Cisco","versions":[{"status":"affected","version":"7.0.0"},{"status":"affected","version":"7.0.0.1"},{"status":"affected","version":"7.0.1"},{"status":"affected","version":"7.1.0"},{"status":"affected","version":"6.4.0.13"},{"status":"affected","version":"7.0.1.1"},{"status":"affected","version":"6.4.0.14"},{"status":"affected","version":"7.1.0.1"},{"status":"affected","version":"7.0.2"},{"status":"affected","version":"6.4.0.15"},{"status":"affected","version":"7.2.0"},{"status":"affected","version":…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:16ef36966f0a424bfa69c48fffd5e693410e0e8ed0446da47cf7fd9dd2180497 · sha256:c15ad0b147b41ab8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:16ef36966f0a424bfa69c48fffd5e693410e0e8ed0446da47cf7fd9dd2180497 · sha256:c15ad0b147b41ab8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-502","description":"Deserialization of Untrusted Data","lang":"en","type":"cwe"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:16ef36966f0a424bfa69c48fffd5e693410e0e8ed0446da47cf7fd9dd2180497 · sha256:c15ad0b147b41ab8… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-502"],"dateAdded":"2026-03-19","dueDate":"2026-03-22","knownRansomwareCampaignUse":"Known","notes":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh ; https://nvd.nist.gov/vuln/detail/CVE-2026-20131","product":"Secure Firewall Management Center (FMC)","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Cisco Secure Firewall Management Center (FMC) Software and Cisco Security …
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:7e855536521213480ccac8e9e3cc304fe549288343950bd91b2d1345137deca1 · sha256:16acee8334e59e44… · /vulnerabilities/111
    Open source location →
{"cwes":["CWE-502"],"dateAdded":"2026-03-19","dueDate":"2026-03-22","knownRansomwareCampaignUse":"Known","notes":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh ; https://nvd.nist.gov/vuln/detail/CVE-2026-20131","product":"Secure Firewall Management Center (FMC)","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Cisco Secure Firewall Management Center (FMC) Software and Cisco Security …
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:1c6fe4a1fa4ae1e69bd0e54873b612ced2b049bc50947decdadf843477fa5852 · sha256:635dff916c4092c0… · /vulnerabilities/114
    Open source location →

Source references

3 source assertions
{"tags":["third-party-advisory"],"url":"https://aws.amazon.com/blogs/security/amazon-threat-intelligence-teams-identify-interlock-ransomware-campaign-targeting-enterprise-firewalls/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:16ef36966f0a424bfa69c48fffd5e693410e0e8ed0446da47cf7fd9dd2180497 · sha256:c15ad0b147b41ab8… · /containers/adp/0/references/0
{"name":"cisco-sa-fmc-rce-NKhnULJh","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:16ef36966f0a424bfa69c48fffd5e693410e0e8ed0446da47cf7fd9dd2180497 · sha256:c15ad0b147b41ab8… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20131"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:16ef36966f0a424bfa69c48fffd5e693410e0e8ed0446da47cf7fd9dd2180497 · sha256:c15ad0b147b41ab8… · /containers/adp/0/references/1

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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