{"id":"CVE-2026-20052","aliases":["EUVD-2026-9458","GHSA-f3x2-jxv4-r583"],"status":"published","title":"Cisco Secure Firewall Threat Defense Software Snort 3 Memory Management Denial of Service Vulnerability","description":"A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets\u0026nbsp;through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.","severity":{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00465,"percentile":0.40562,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-788"],"published":"2026-03-04T17:46:57Z","modified":"2026-08-20T16:39:17Z","products":[{"vendor":"cisco","product":"cisco secure firewall threat defense (ftd) software"},{"vendor":"cisco","product":"secure_firewall_threat_defense"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3ssl-FBEKYXpH","tags":["Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20052"},{"url":"https://github.com/advisories/GHSA-f3x2-jxv4-r583"}],"sources":{"cve":[{"id":"CVE-2026-20052","title":"Cisco Secure Firewall Threat Defense Software Snort 3 Memory Management Denial of Service Vulnerability","description":"A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets\u0026nbsp;through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.","status":"published","published":"2026-03-04T17:46:57.096Z","modified":"2026-03-04T20:46:43.211Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-788"],"updated_at":"2026-11-02T13:35:55.731353Z"}],"euvd":[{"id":"EUVD-2026-9458","description":"A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets\u0026nbsp;through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.","status":"published","published":"2026-03-04T17:46:57Z","modified":"2026-03-04T20:46:43Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T19:48:11.18109Z"}],"ghsa":[{"id":"GHSA-f3x2-jxv4-r583","title":"A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco...","description":"A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\n\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets\u0026nbsp;through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.","status":"published","published":"2026-03-04T18:31:55Z","modified":"2026-03-04T18:31:55Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-788"],"updated_at":"2026-11-02T15:06:26.948991Z"}],"nvd":[{"id":"CVE-2026-20052","description":"A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets\u0026nbsp;through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.","status":"published","published":"2026-03-04T18:16:19.42Z","modified":"2026-08-20T16:39:17.133Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-788"],"updated_at":"2026-11-02T14:12:07.420927Z"}]}}