{"answers":{"affected":"It affects 1 product.","exploited":"Yes. Attackers have exploited CVE-2026-20131 in the wild since at least 19 Mar 2026, including in ransomware campaigns.","fix":"No fix has been published for CVE-2026-20131 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 22 Mar 2026.","what":"CVE-2026-20131 is a critical unsafe deserialization vulnerability in Cisco Secure Firewall Management Center, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-20131 and fix it if it is affected.\n\nWhat it is: CVE-2026-20131 is a critical unsafe deserialization vulnerability in Cisco Secure Firewall Management Center, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2026-20131 in the wild since at least 19 Mar 2026, including in ransomware campaigns.\n\nAffected product: Cisco Secure Firewall Management Center. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-20131/ (Markdown: https://insights.sbomify.com/CVE-2026-20131/index.md)","id":"CVE-2026-20131","markdown":"https://insights.sbomify.com/CVE-2026-20131/index.md","name":"CVE-2026-20131","record":{"aliases":["GHSA-r229-mj76-g2qx"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco FMC","requires_auth":"none","summary":"Unauthenticated remote attackers can execute arbitrary Java code as root via insecure deserialization in the Cisco Secure Firewall Management Center web interface.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"secure_firewall_management_center","vendor":"cisco"}],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"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\u0026nbsp;on an affected device.\r\n\r\nThis 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 allow the attacker to execute arbitrary code on the device and elevate privileges to root.\r\nNote: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-03-06","github_poc":6,"max_poc_stars":3,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-03-11T01:30:51Z","kind":"github_poc","ref":"https://github.com/sak110/CVE-2026-20131","stars":3,"title":null},{"date":"2026-04-07T03:35:37Z","kind":"github_poc","ref":"https://github.com/Hassan-Pouladi/Cisco-FMC-honeypot","stars":2,"title":"Originally a Honeypot for CVE-2026-20131"},{"date":"2026-03-06T07:06:56Z","kind":"github_poc","ref":"https://github.com/p3Nt3st3r-sTAr/CVE-2026-20131-POC","stars":0,"title":null},{"date":"2026-05-10T14:02:19Z","kind":"github_poc","ref":"https://github.com/0xredash/CVE-2026-20131","stars":0,"title":"CVE-2026-20131"},{"date":"2026-08-28T00:24:31Z","kind":"github_poc","ref":"https://github.com/Jwa7470/CVE-2026-20131-Post-Incident-Written-Report","stars":0,"title":"Post-incident report on CVE-2026-20131 (CVSS 10.0), a Cisco FMC insecure deserialization vulnerability exploited by Interlock ransomware. Details root-cause analysis, lateral movement tactics, and emergency containment strategies."},{"date":"2026-10-26T05:19:19Z","kind":"github_poc","ref":"https://github.com/basesixtythree/B63-POC-CVE-2026-20131","stars":0,"title":"CVE-2026-20131 (Cisco FMC): pre-auth Java deserialization to root — VERIFIED-AT-PRIMITIVE showcase artifact (rebuilt twins; appliance not executed, entitlement-gated)"}],"tier":"exploited"},"has_fix":null,"headline":"Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data","id":"CVE-2026-20131","indexable":true,"kev":{"dateAdded":"2026-03-19","dueDate":"2026-03-22","knownRansomwareCampaignUse":"Known","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.","vendorProject":"Cisco","vulnerabilityName":"Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":"cisco:secure_firewall_management_center","products":["cisco:secure_firewall_management_center"],"type":"deserialization","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Cisco Identity Services Engine Multiple Cross-Site Scripting Vulnerabilities","id":"CVE-2026-20132"},"packages":[],"prev":{"headline":"Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities","id":"CVE-2026-20130"},"products":["Cisco Secure Firewall Management Center (FMC)"],"published":"2026-03-04","related":[{"cvss_score":10,"headline":"Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel","id":"CVE-2026-20079","kev_date_added":"2026-09-09","published":"2026-03-04"},{"cvss_score":5.3,"headline":"Cisco Secure Firewall Management Center Use of Hard-coded Password","id":"CVE-2026-20316","kev_date_added":"2026-07-29","published":"2026-07-29"},{"cvss_score":10,"headline":"Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerability","id":"CVE-2025-20265","kev_date_added":null,"published":"2025-08-14"},{"cvss_score":9.9,"headline":"Command injection in Cisco Firepower Management Center","id":"CVE-2024-20424","kev_date_added":null,"published":"2024-10-23"},{"cvss_score":9.9,"headline":"Missing authorization in Cisco Firepower Management Center","id":"CVE-2023-20048","kev_date_added":null,"published":"2023-11-01"},{"cvss_score":9.8,"headline":"Cisco Firepower Management Center Lightweight Directory Access Protocol Authentication Bypass Vulnerability","id":"CVE-2019-16028","kev_date_added":null,"published":"2020-09-23"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-14","vendors":["Cisco"]},"summary":"Unauthenticated remote attackers can execute arbitrary Java code as root via insecure deserialization in the Cisco Secure Firewall Management Center web interface.","url":"https://insights.sbomify.com/CVE-2026-20131/"}