CVE-2026-20066Medium· 5.8▾ SunlitMultiple 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 inspect…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 31.9 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
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.
snort >= 3.0.0-233, < 3.9.7.0secure_firewall_threat_defense = 7.4.0secure_firewall_threat_defense = 7.4.1secure_firewall_threat_defense = 7.4.1.1secure_firewall_threat_defense = 7.4.2secure_firewall_threat_defense = 7.4.2.1secure_firewall_threat_defense = 7.4.2.2secure_firewall_threat_defense = 7.4.2.3secure_firewall_threat_defense = 7.4.2.4secure_firewall_threat_defense = 7.4.3secure_firewall_threat_defense = 7.6.0secure_firewall_threat_defense = 7.6.1secure_firewall_threat_defense = 7.6.2secure_firewall_threat_defense = 7.6.2.1secure_firewall_threat_defense = 7.7.0secure_firewall_threat_defense = 7.7.10secure_firewall_threat_defense = 7.7.10.1unified_threat_defense_snort_intrusion_prevention_system_engine = 17.2.1runified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.2unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.3unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.4unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.4aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.5unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.6unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.7unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.8unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.8aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.1bunified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.2unified_threat_defense_snort_intrusion_prevention_system_engine = 17.5.1unified_threat_defense_snort_intrusion_prevention_system_engine = 17.5.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.2unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.3unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.3aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.4unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.5unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.6unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.6aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.7unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.8unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.8aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.7.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.7.2unified_threat_defense_snort_intrusion_prevention_system_engine = 17.8.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.2aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.3aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.4unified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.4aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.5aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.5eunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.5funified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.6unified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.7aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.7bunified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.8unified_threat_defense_snort_intrusion_prevention_system_engine = 17.10.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.11.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.2unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4bunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5bunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5cunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5dunified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.6unified_threat_defense_snort_intrusion_prevention_system_engine = 17.13.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.14.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.2aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.2cunified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.3unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.3aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.4unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.4cunified_threat_defense_snort_intrusion_prevention_system_engine = 17.16.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.17.1unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.1unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.1aunified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.2Upgrade past the affected range:
snort 3.9.7.0Connected by shared product, vendor, weakness, or advisory.
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