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CVE-2026-20066Disclosure(cisco / secure_firewall_threat_defense)

LOWCVSS 5.8 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-400

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • secure_firewall_threat_defense
  • snort
  • unified_threat_defense_snort_intrusion_prevention_system_engine

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
cisco
Products
secure_firewall_threat_defensesnortunified_threat_defense_snort_intrusion_prevention_system_engine

87 versions affected across 3 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-03-04: 103-04
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • CVE@CVEnew
    Disclosure

    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 Dete… https://www.cve.org/CVERecord?id=CVE-2026-20066

    Post summary

    This is a disclosure of CVE-2026-20066, noting that multiple Cisco products use Snort 3 Detection Engine and are vulnerable to remote unauthenticated attacks; no PoC, exploit, or patch information is provided.

    0000085
    56.6K followersView on X
CPE platform detail88 entries

88 of 88 entries

PartVendorProductVersionTarget SWTarget HW
Appciscosecure_firewall_threat_defense7.4.0--
Appciscosecure_firewall_threat_defense7.4.1--
Appciscosecure_firewall_threat_defense7.4.1.1--
Appciscosecure_firewall_threat_defense7.4.2--
Appciscosecure_firewall_threat_defense7.4.2.1--
Appciscosecure_firewall_threat_defense7.4.2.2--
Appciscosecure_firewall_threat_defense7.4.2.3--
Appciscosecure_firewall_threat_defense7.4.2.4--
Appciscosecure_firewall_threat_defense7.4.3--
Appciscosecure_firewall_threat_defense7.6.0--
Appciscosecure_firewall_threat_defense7.6.1--
Appciscosecure_firewall_threat_defense7.6.2--
Appciscosecure_firewall_threat_defense7.6.2.1--
Appciscosecure_firewall_threat_defense7.7.0--
Appciscosecure_firewall_threat_defense7.7.10--
Appciscosecure_firewall_threat_defense7.7.10.1--
Appciscosnort---
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.10.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.11.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.2--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.3--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.3a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.4--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.4a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.4b--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.5--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.5a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.5b--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.5c--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.5d--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.12.6--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.13.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.14.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.2a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.2c--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.3--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.3a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.4--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.15.4c--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.16.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.17.1--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.18.1--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.18.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.18.2--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.2.1r--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.2--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.3--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.4--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.4a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.5--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.6--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.7--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.8--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.3.8a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.4.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.4.1b--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.4.2--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.5.1--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.5.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.2--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.3--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.3a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.4--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.5--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.6--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.6a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.7--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.8--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.6.8a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.7.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.7.2--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.8.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.1a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.2a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.3a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.4--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.4a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.5a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.5e--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.5f--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.6--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.7a--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.7b--
OSciscounified_threat_defense_snort_intrusion_prevention_system_engine17.9.8--

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