{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-20340 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-20340 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-20340 is a high-severity unsafe deserialization vulnerability in Cisco Secure Firewall Management Center (FMC), published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-20340 and fix it if it is affected.\n\nWhat it is: CVE-2026-20340 is a high-severity unsafe deserialization vulnerability in Cisco Secure Firewall Management Center (FMC), published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-20340 in the wild and no public exploit code.\n\nAffected product: Cisco Secure Firewall Management Center (FMC). 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-2026-20340/ (Markdown: https://insights.sbomify.com/CVE-2026-20340/index.md)","id":"CVE-2026-20340","markdown":"https://insights.sbomify.com/CVE-2026-20340/index.md","name":"CVE-2026-20340","record":{"aliases":["GHSA-xpr9-grjf-6fm6"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco Secure Firewall Management Center","requires_auth":"low_privilege","summary":"Authenticated attackers can execute arbitrary root commands via unsafe deserialization in Cisco Secure Firewall Management Center.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"A vulnerability in Cisco Secure FMC Software could allow an authenticated, remote attacker to execute arbitrary commands at the\u0026nbsp;root privilege level.\r\n\r\nThis vulnerability is due to unsecured deserialization of web-management user-controlled data. An attacker could exploit this vulnerability by authenticating to the device and sending a crafted HTTP payload. A successful exploit could allow the attacker to save the crafted payload and then execute it on the underlying operating system as root.\r\nTo exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Cisco Secure Firewall Management Center Software Deserialization Arbitrary Root Command Execution Vulnerability","id":"CVE-2026-20340","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Cisco Secure Firewall Management Center Software sftunnel Deserialization Root Command Execution Vulnerability","id":"CVE-2026-20341"},"packages":[],"prev":{"headline":"ClamAV PESpin File Format Processing Integer Overflow Vulnerability","id":"CVE-2026-20339"},"products":["Cisco Secure Firewall Management Center (FMC)"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["Cisco"]},"summary":"Authenticated attackers can execute arbitrary root commands via unsafe deserialization in Cisco Secure Firewall Management Center.","url":"https://insights.sbomify.com/CVE-2026-20340/"}