CVE-2026-20005

Published: Mar 4, 2026Modified: Sep 1, 2026

5.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Exploitability: 3.9 / Impact: 1.4

Source: psirt@cisco.com (Secondary)

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 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 (90)

Products: Cisco: Cyber Vision, Secure Firewall Threat Defense, Unified Threat Defense Snort Intrusion Prevention System Engine, Snort

Cisco

4 products

Cyber Vision

Secure Firewall Threat Defense

Unified Threat Defense Snort Intrusion Prevention System Engine

Snort

Configuration A

53 vulnerable

Vulnerable Software	Affected Versions
Cisco Cyber Vision	Version 3.0.0
Cisco Cyber Vision	Version 3.0.1
Cisco Cyber Vision	Version 3.0.2
Cisco Cyber Vision	Version 3.0.3
Cisco Cyber Vision	Version 3.0.4
Cisco Cyber Vision	Version 3.0.5
Cisco Cyber Vision	Version 3.0.6
Cisco Cyber Vision	Version 3.1.0
Cisco Cyber Vision	Version 3.1.1
Cisco Cyber Vision	Version 3.1.2
Cisco Cyber Vision	Version 3.2.0
Cisco Cyber Vision	Version 3.2.1
Cisco Cyber Vision	Version 3.2.2
Cisco Cyber Vision	Version 3.2.3
Cisco Cyber Vision	Version 3.2.4
Cisco Cyber Vision	Version 4.0.0
Cisco Cyber Vision	Version 4.0.1
Cisco Cyber Vision	Version 4.0.2
Cisco Cyber Vision	Version 4.0.3
Cisco Cyber Vision	Version 4.1.0
Cisco Cyber Vision	Version 4.1.1
Cisco Cyber Vision	Version 4.1.2
Cisco Cyber Vision	Version 4.1.3
Cisco Cyber Vision	Version 4.1.4
Cisco Cyber Vision	Version 4.1.5
Cisco Cyber Vision	Version 4.1.6
Cisco Cyber Vision	Version 4.1.7
Cisco Cyber Vision	Version 4.2.0
Cisco Cyber Vision	Version 4.2.1
Cisco Cyber Vision	Version 4.2.2
Cisco Cyber Vision	Version 4.2.3
Cisco Cyber Vision	Version 4.2.4
Cisco Cyber Vision	Version 4.2.6
Cisco Cyber Vision	Version 4.3.0
Cisco Cyber Vision	Version 4.3.1
Cisco Cyber Vision	Version 4.3.2
Cisco Cyber Vision	Version 4.3.3
Cisco Cyber Vision	Version 4.4.0
Cisco Cyber Vision	Version 4.4.1
Cisco Cyber Vision	Version 4.4.2
Cisco Cyber Vision	Version 4.4.3
Cisco Cyber Vision	Version 5.0.0
Cisco Cyber Vision	Version 5.0.1
Cisco Cyber Vision	Version 5.0.2
Cisco Cyber Vision	Version 5.1.0
Cisco Cyber Vision	Version 5.1.1
Cisco Cyber Vision	Version 5.1.2
Cisco Cyber Vision	Version 5.1.3
Cisco Cyber Vision	Version 5.2.0
Cisco Cyber Vision	Version 5.2.1
Cisco Cyber Vision	Version 5.3.0
Cisco Cyber Vision	Version 5.3.1
Cisco Cyber Vision	Version 5.3.2

Configuration B

7 vulnerable

Vulnerable Software	Affected Versions
Cisco Secure Firewall Threat Defense	Version 7.6.0
Cisco Secure Firewall Threat Defense	Version 7.6.1
Cisco Secure Firewall Threat Defense	Version 7.6.2.1
Cisco Secure Firewall Threat Defense	Version 7.6.2
Cisco Secure Firewall Threat Defense	Version 7.7.0
Cisco Secure Firewall Threat Defense	Version 7.7.10.1
Cisco Secure Firewall Threat Defense	Version 7.7.10

Configuration C

29 vulnerable

Vulnerable Software	Affected Versions
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.4a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.4b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.5
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.5a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.5b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.5c
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.5d
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.12.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.13.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.14.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.2a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.2c
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.15.4c
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.16.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.17.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.18.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.18.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.18.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.5e

Configuration D

1 vulnerable · 19 platform

Vulnerable Software	Affected Versions
Cisco Snort	From 3.0.0-233 to 3.9.2.0

Running on/with	Platform Versions
Cisco Meraki Mx100	All versions
Cisco Meraki Mx105	All versions
Cisco Meraki Mx250	All versions
Cisco Meraki Mx400	All versions
Cisco Meraki Mx450	All versions
Cisco Meraki Mx600	All versions
Cisco Meraki Mx64	All versions
Cisco Meraki Mx64w	All versions
Cisco Meraki Mx65	All versions
Cisco Meraki Mx65w	All versions
Cisco Meraki Mx67	All versions
Cisco Meraki Mx67c	All versions
Cisco Meraki Mx67w	All versions
Cisco Meraki Mx68	All versions
Cisco Meraki Mx68cw	All versions
Cisco Meraki Mx75	All versions
Cisco Meraki Mx84	All versions
Cisco Meraki Mx85	All versions
Cisco Meraki Mx95	All versions

Related CWEs

CWE-392

Missing Report of Error Condition

The product encounters an error but does not provide a status code or return value to indicate that an error has occurred.

References (1)

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz

Source: psirt@cisco.com

Vendor Advisory

Timeline

No history available yet.