{"id":"CVE-2026-20343","aliases":["EUVD-2026-81126","GHSA-mxj5-v55g-6rm4"],"status":"published","title":"Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability","description":"A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.\r\n\r\nThis vulnerability exists because a critical API lacks authentication.\u0026nbsp;An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00658,"percentile":0.51924,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-306"],"published":"2026-09-16T20:12:19Z","modified":"2026-09-18T15:17:07Z","products":[{"vendor":"cisco","product":"cisco secure firewall management center (fmc)"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-mulivulns-4PsnFwvx"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20343"},{"url":"https://github.com/advisories/GHSA-mxj5-v55g-6rm4"}],"sources":{"cve":[{"id":"CVE-2026-20343","title":"Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability","description":"A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.\r\n\r\nThis vulnerability exists because a critical API lacks authentication.\u0026nbsp;An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.","status":"published","published":"2026-09-16T20:12:19.94Z","modified":"2026-09-18T14:46:28.683Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T13:35:55.731353Z"}],"euvd":[{"id":"EUVD-2026-81126","description":"A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.\r\n\r\nThis vulnerability exists because a critical API lacks authentication.\u0026nbsp;An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.","status":"published","published":"2026-09-16T20:12:19Z","modified":"2026-09-18T14:46:28Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:08.412343Z"}],"ghsa":[{"id":"GHSA-mxj5-v55g-6rm4","title":"A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated,...","description":"A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.\n\nThis vulnerability exists because a critical API lacks authentication.\u0026nbsp;An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.","status":"published","published":"2026-09-16T21:32:50Z","modified":"2026-09-16T21:32:56Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:12:02.762055Z"}],"nvd":[{"id":"CVE-2026-20343","description":"A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.\r\n\r\nThis vulnerability exists because a critical API lacks authentication.\u0026nbsp;An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.","status":"published","published":"2026-09-16T21:17:11.85Z","modified":"2026-09-18T15:17:07.577Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:12:49.013904Z"}]}}