Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.

cisco cisco-sa-asa-scpcxt-filecpy-rgeP73nE: Cisco Secure Firewall Adaptive Security Appliance Software Multiple Context Mode SCP Unauthorized File Access Vulnerability

cisco cisco-sa-fmc-sql-injection-2qH6CcJd_CVE-2026-20003: Cisco Secure Firewall Management Center Software SQL Injection Vulnerabilities

cisco cisco-sa-asaftd-ospf-ZH8PhbSW_CVE-2026-20020: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software OSPF Protocol Vulnerabilities

cisco cisco-sa-asa-dos-FCvLD6vR: Cisco Secure Firewall Adaptive Security Appliance Software TCP Flood Denial of Service Vulnerability

cisco cisco-sa-asaftd-esp-dos-uv7yD8P5: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IPsec Denial of Service Vulnerability

cisco cisco-sa-asaftd-ikev2-dos-eBueGdEG_CVE-2026-20013: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Denial of Service Vulnerabilities

According to its self-reported version, Cisco Secure Firewall Threat Defense (FTD) Software is affected by multiple vulnerabilities.

  - Multiple Cisco products are affected by vulnerabilities in the Snort 3 detection engine that could allow     an unauthenticated, remote attacker to cause the Snort 3 detection engine to unexpectedly restart,     resulting in a denial of service (DoS) condition. (CVE-2026-20005, CVE-2026-20065, CVE-2026-20066,     CVE-2026-20067, CVE-2026-20068)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

According to its self-reported version, Cisco ASA Software is affected by a vulnerability.

  - Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow     an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an     interruption of packet inspection. This vulnerability is due to incomplete parsing of the SSL handshake     ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A     successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3     Detection Engine restarts unexpectedly. (CVE-2026-20005)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

ID	Name	Product	Family	Severity
311446	Multiple Cisco Products Snort 3 Multiple DoS (cisco-sa-snort3-multi-dos-XFWkWSwz)	Nessus	CISCO	medium
301699	Multiple Cisco Products Snort 3 DoS Vulnerabilities (cisco-sa-snort3-multi-dos-XFWkWSwz_CVE-2026-20005)	Nessus	CISCO	medium

Detections

Analytics

CVE-2026-20005

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Tenable Plugins

Coming Soon

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