CVE-2026-20068

Published: Mar 4, 2026Modified: Aug 18, 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 error checking when parsing remote procedure call (RPC) data. An attacker could exploit this vulnerability by sending crafted RPC packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.

Affected (153)

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

Cisco

4 products

Snort

Cyber Vision

Secure Firewall Threat Defense

Unified Threat Defense Snort Intrusion Prevention System Engine

Configuration A

1 vulnerable

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

Configuration B

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 C

28 vulnerable

Vulnerable Software	Affected Versions
Cisco Secure Firewall Threat Defense	Version 7.2.10.2
Cisco Secure Firewall Threat Defense	Version 7.2.10
Cisco Secure Firewall Threat Defense	Version 7.2.4.1
Cisco Secure Firewall Threat Defense	Version 7.2.4
Cisco Secure Firewall Threat Defense	Version 7.2.5.1
Cisco Secure Firewall Threat Defense	Version 7.2.5.2
Cisco Secure Firewall Threat Defense	Version 7.2.5
Cisco Secure Firewall Threat Defense	Version 7.2.6
Cisco Secure Firewall Threat Defense	Version 7.2.7
Cisco Secure Firewall Threat Defense	Version 7.2.8.1
Cisco Secure Firewall Threat Defense	Version 7.2.8
Cisco Secure Firewall Threat Defense	Version 7.2.9
Cisco Secure Firewall Threat Defense	Version 7.4.0
Cisco Secure Firewall Threat Defense	Version 7.4.1.1
Cisco Secure Firewall Threat Defense	Version 7.4.1
Cisco Secure Firewall Threat Defense	Version 7.4.2.1
Cisco Secure Firewall Threat Defense	Version 7.4.2.2
Cisco Secure Firewall Threat Defense	Version 7.4.2.3
Cisco Secure Firewall Threat Defense	Version 7.4.2.4
Cisco Secure Firewall Threat Defense	Version 7.4.2
Cisco Secure Firewall Threat Defense	Version 7.4.3
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 D

71 vulnerable

Vulnerable Software	Affected Versions
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.10.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.11.1a
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 17.2.1r
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.4a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.5
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.7
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.8
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.3.8a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.4.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.4.1b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.4.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.5.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.5.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.5
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.6a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.7
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.8
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.6.8a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.7.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.7.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.8.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.2a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.4a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.5a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.5e
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.5f
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.7a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.7b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine	Version 17.9.8

Related CWEs

CWE-248

Uncaught Exception

An exception is thrown from a function, but it is not caught.

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.