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CVE PROGRAM SOURCE RECORD5.8 Medium

CVE-2026-20066

Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability

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Status
Published
Published
Updated
Assigning organization
cisco

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Cisco Cisco Secure Firewall Threat Defense (FTD) Software

Default version status: unknown

  • 7.4.0affected
  • 7.4.1affected
  • 7.4.1.1affected
  • 7.6.0affected
  • 7.4.2affected
  • 7.4.2.1affected
  • 7.7.0affected
  • 7.4.2.2affected
  • 7.6.1affected
  • 7.4.2.3affected
  • 7.6.2affected
  • 7.7.10affected
  • 7.6.2.1affected
  • 7.7.10.1affected
  • 7.4.2.4affected
  • 7.4.3affected

Cisco Cisco UTD SNORT IPS Engine Software

Default version status: unknown

  • 17.3.1aaffected
  • 17.2.1raffected
  • 17.3.2affected
  • 17.4.1aaffected
  • 17.5.1affected
  • 17.3.3affected
  • 17.5.1aaffected
  • 17.3.4affected
  • 17.3.4aaffected
  • 17.4.2affected
  • 17.4.1baffected
  • 17.6.1aaffected
  • 17.7.1aaffected
  • 17.6.2affected
  • 17.8.1aaffected
  • 17.3.5affected
  • 17.6.3affected
  • 17.6.3aaffected
  • 17.7.2affected
  • 17.9.1aaffected
  • 17.6.4affected
  • 17.10.1aaffected
  • 17.3.6affected
  • 17.3.7affected
  • 17.9.2aaffected
  • 17.6.5affected
  • 17.11.1aaffected
  • 17.9.3aaffected
  • 17.12.1aaffected
  • 17.9.4affected
  • 17.6.6affected
  • 17.3.8affected
  • 17.3.8aaffected
  • 17.6.6aaffected
  • 17.9.4aaffected
  • 17.12.2affected
  • 17.13.1aaffected
  • 17.9.5aaffected
  • 17.12.3affected
  • 17.6.7affected
  • 17.14.1aaffected
  • 17.12.4affected
  • 17.12.3aaffected
  • 17.15.1aaffected
  • 17.6.8affected
  • 17.9.6affected
  • 17.6.8aaffected
  • 17.16.1aaffected
  • 17.9.5eaffected
  • 17.12.4aaffected
  • 17.15.2caffected
  • 17.9.5faffected
  • 17.12.4baffected
  • 17.15.2aaffected
  • 17.12.5affected
  • 17.17.1affected
  • 17.12.5aaffected
  • 17.9.7aaffected
  • 17.15.3aaffected
  • 17.15.3affected
  • 17.12.5baffected
  • 17.12.5caffected
  • 17.15.4affected
  • 17.9.7baffected
  • 17.18.1affected
  • 17.18.1aaffected
  • 17.12.6affected
  • 17.9.8affected
  • 17.15.4caffected
  • 17.12.5daffected
  • 17.18.2affected

References