---
id: CVE-2026-20005
title: >-
  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 inspect…
summary: >-
  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 inspect…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'
cwe:
  - CWE-392
vendor: cisco
product: cyber_vision
affected:
  - cyber_vision = 3.0.0
  - cyber_vision = 3.0.1
  - cyber_vision = 3.0.2
  - cyber_vision = 3.0.3
  - cyber_vision = 3.0.4
  - cyber_vision = 3.0.5
  - cyber_vision = 3.0.6
  - cyber_vision = 3.1.0
  - cyber_vision = 3.1.1
  - cyber_vision = 3.1.2
  - cyber_vision = 3.2.0
  - cyber_vision = 3.2.1
  - cyber_vision = 3.2.2
  - cyber_vision = 3.2.3
  - cyber_vision = 3.2.4
  - cyber_vision = 4.0.0
  - cyber_vision = 4.0.1
  - cyber_vision = 4.0.2
  - cyber_vision = 4.0.3
  - cyber_vision = 4.1.0
  - cyber_vision = 4.1.1
  - cyber_vision = 4.1.2
  - cyber_vision = 4.1.3
  - cyber_vision = 4.1.4
  - cyber_vision = 4.1.5
  - cyber_vision = 4.1.6
  - cyber_vision = 4.1.7
  - cyber_vision = 4.2.0
  - cyber_vision = 4.2.1
  - cyber_vision = 4.2.2
  - cyber_vision = 4.2.3
  - cyber_vision = 4.2.4
  - cyber_vision = 4.2.6
  - cyber_vision = 4.3.0
  - cyber_vision = 4.3.1
  - cyber_vision = 4.3.2
  - cyber_vision = 4.3.3
  - cyber_vision = 4.4.0
  - cyber_vision = 4.4.1
  - cyber_vision = 4.4.2
  - cyber_vision = 4.4.3
  - cyber_vision = 5.0.0
  - cyber_vision = 5.0.1
  - cyber_vision = 5.0.2
  - cyber_vision = 5.1.0
  - cyber_vision = 5.1.1
  - cyber_vision = 5.1.2
  - cyber_vision = 5.1.3
  - cyber_vision = 5.2.0
  - cyber_vision = 5.2.1
  - cyber_vision = 5.3.0
  - cyber_vision = 5.3.1
  - cyber_vision = 5.3.2
  - secure_firewall_threat_defense = 7.6.0
  - secure_firewall_threat_defense = 7.6.1
  - secure_firewall_threat_defense = 7.6.2
  - secure_firewall_threat_defense = 7.6.2.1
  - secure_firewall_threat_defense = 7.7.0
  - secure_firewall_threat_defense = 7.7.10
  - secure_firewall_threat_defense = 7.7.10.1
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.4
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.5e
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.1a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.2
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4b
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5b
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5c
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5d
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.6
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.13.1a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.14.1a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.1a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.2a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.2c
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.3
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.3a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.4
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.4c
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.16.1a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.17.1
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.1
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.1a
  - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.2
  - 'snort >= 3.0.0-233, < 3.9.2.0'
patched:
  - snort 3.9.2.0
published: '2026-03-04'
updated: '2026-09-01'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20005'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz
    label: psirt@cisco.com
tags:
  - nvd
epss: 0.0049
epssPercentile: 0.41103
ingestedAt: '2026-09-01T20:32:01.233Z'
---

## Overview

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 incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.

## Affected

- `cyber_vision = 3.0.0`
- `cyber_vision = 3.0.1`
- `cyber_vision = 3.0.2`
- `cyber_vision = 3.0.3`
- `cyber_vision = 3.0.4`
- `cyber_vision = 3.0.5`
- `cyber_vision = 3.0.6`
- `cyber_vision = 3.1.0`
- `cyber_vision = 3.1.1`
- `cyber_vision = 3.1.2`
- `cyber_vision = 3.2.0`
- `cyber_vision = 3.2.1`
- `cyber_vision = 3.2.2`
- `cyber_vision = 3.2.3`
- `cyber_vision = 3.2.4`
- `cyber_vision = 4.0.0`
- `cyber_vision = 4.0.1`
- `cyber_vision = 4.0.2`
- `cyber_vision = 4.0.3`
- `cyber_vision = 4.1.0`
- `cyber_vision = 4.1.1`
- `cyber_vision = 4.1.2`
- `cyber_vision = 4.1.3`
- `cyber_vision = 4.1.4`
- `cyber_vision = 4.1.5`
- `cyber_vision = 4.1.6`
- `cyber_vision = 4.1.7`
- `cyber_vision = 4.2.0`
- `cyber_vision = 4.2.1`
- `cyber_vision = 4.2.2`
- `cyber_vision = 4.2.3`
- `cyber_vision = 4.2.4`
- `cyber_vision = 4.2.6`
- `cyber_vision = 4.3.0`
- `cyber_vision = 4.3.1`
- `cyber_vision = 4.3.2`
- `cyber_vision = 4.3.3`
- `cyber_vision = 4.4.0`
- `cyber_vision = 4.4.1`
- `cyber_vision = 4.4.2`
- `cyber_vision = 4.4.3`
- `cyber_vision = 5.0.0`
- `cyber_vision = 5.0.1`
- `cyber_vision = 5.0.2`
- `cyber_vision = 5.1.0`
- `cyber_vision = 5.1.1`
- `cyber_vision = 5.1.2`
- `cyber_vision = 5.1.3`
- `cyber_vision = 5.2.0`
- `cyber_vision = 5.2.1`
- `cyber_vision = 5.3.0`
- `cyber_vision = 5.3.1`
- `cyber_vision = 5.3.2`
- `secure_firewall_threat_defense = 7.6.0`
- `secure_firewall_threat_defense = 7.6.1`
- `secure_firewall_threat_defense = 7.6.2`
- `secure_firewall_threat_defense = 7.6.2.1`
- `secure_firewall_threat_defense = 7.7.0`
- `secure_firewall_threat_defense = 7.7.10`
- `secure_firewall_threat_defense = 7.7.10.1`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.4`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.9.5e`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.1a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.2`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4b`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5b`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5c`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5d`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.6`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.13.1a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.14.1a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.1a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.2a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.2c`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.3`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.3a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.4`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.15.4c`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.16.1a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.17.1`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.1`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.1a`
- `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.18.2`
- `snort >= 3.0.0-233, < 3.9.2.0`

## Remediation

Upgrade past the affected range:

- `snort 3.9.2.0`