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 an error in the JSTokenizer normalization logic when the HTTP inspection normalizes JavaScript. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly. JSTokenizer is not enabled by default.

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

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-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 an error in the JSTokenizer normalization     logic when the HTTP inspection normalizes JavaScript. An attacker could exploit this vulnerability by     sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful     exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts     unexpectedly. JSTokenizer is not enabled by default. (CVE-2026-20066)

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
301693	Multiple Cisco Products Snort 3 DoS Vulnerabilities (cisco-sa-snort3-multi-dos-XFWkWSwz_CVE-2026-20066)	Nessus	CISCO	medium

Detections

Analytics

CVE-2026-20066

medium

Tenable Plugins

Coming Soon

medium

medium