CVE-2026-20066

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 snort (>= 3.0.0-233 < 3.9.7.0) • cisco secure firewall threat defense 7.4.0 • cisco secure firewall threat defense 7.4.1 • cisco secure firewall threat defense 7.4.1.1 • cisco secure firewall threat defense 7.4.2 • cisco secure firewall threat defense 7.4.2.1 • cisco secure firewall threat defense 7.4.2.2 • cisco secure firewall threat defense 7.4.2.3 • cisco secure firewall threat defense 7.4.2.4 • cisco secure firewall threat defense 7.4.3 • cisco secure firewall threat defense 7.6.0 • cisco secure firewall threat defense 7.6.1 • cisco secure firewall threat defense 7.6.2 • cisco secure firewall threat defense 7.6.2.1 • cisco secure firewall threat defense 7.7.0 • cisco secure firewall threat defense 7.7.10 • cisco secure firewall threat defense 7.7.10.1 • cisco unified threat defense snort intrusion prevention system engine 17.2.1r • cisco unified threat defense snort intrusion prevention system engine 17.3.1a • cisco unified threat defense snort intrusion prevention system engine 17.3.2 • cisco unified threat defense snort intrusion prevention system engine 17.3.3 • cisco unified threat defense snort intrusion prevention system engine 17.3.4 • cisco unified threat defense snort intrusion prevention system engine 17.3.4a • cisco unified threat defense snort intrusion prevention system engine 17.3.5 • cisco unified threat defense snort intrusion prevention system engine 17.3.6 • cisco unified threat defense snort intrusion prevention system engine 17.3.7 • cisco unified threat defense snort intrusion prevention system engine 17.3.8 • cisco unified threat defense snort intrusion prevention system engine 17.3.8a • cisco unified threat defense snort intrusion prevention system engine 17.4.1a • cisco unified threat defense snort intrusion prevention system engine 17.4.1b • cisco unified threat defense snort intrusion prevention system engine 17.4.2 • cisco unified threat defense snort intrusion prevention system engine 17.5.1 • cisco unified threat defense snort intrusion prevention system engine 17.5.1a • cisco unified threat defense snort intrusion prevention system engine 17.6.1a • cisco unified threat defense snort intrusion prevention system engine 17.6.2 • cisco unified threat defense snort intrusion prevention system engine 17.6.3 • cisco unified threat defense snort intrusion prevention system engine 17.6.3a • cisco unified threat defense snort intrusion prevention system engine 17.6.4 • cisco unified threat defense snort intrusion prevention system engine 17.6.5 • cisco unified threat defense snort intrusion prevention system engine 17.6.6 • cisco unified threat defense snort intrusion prevention system engine 17.6.6a • cisco unified threat defense snort intrusion prevention system engine 17.6.7 • cisco unified threat defense snort intrusion prevention system engine 17.6.8 • cisco unified threat defense snort intrusion prevention system engine 17.6.8a • cisco unified threat defense snort intrusion prevention system engine 17.7.1a • cisco unified threat defense snort intrusion prevention system engine 17.7.2 • cisco unified threat defense snort intrusion prevention system engine 17.8.1a • cisco unified threat defense snort intrusion prevention system engine 17.9.1a • cisco unified threat defense snort intrusion prevention system engine 17.9.2a • cisco unified threat defense snort intrusion prevention system engine 17.9.3a • cisco unified threat defense snort intrusion prevention system engine 17.9.4 • cisco unified threat defense snort intrusion prevention system engine 17.9.4a • cisco unified threat defense snort intrusion prevention system engine 17.9.5a • cisco unified threat defense snort intrusion prevention system engine 17.9.5e • cisco unified threat defense snort intrusion prevention system engine 17.9.5f • cisco unified threat defense snort intrusion prevention system engine 17.9.6 • cisco unified threat defense snort intrusion prevention system engine 17.9.7a • cisco unified threat defense snort intrusion prevention system engine 17.9.7b • cisco unified threat defense snort intrusion prevention system engine 17.9.8 • cisco unified threat defense snort intrusion prevention system engine 17.10.1a … and 28 more