CVE-2026-20053

Published: Mar 4, 2026Modified: Aug 20, 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 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.

Affected (120)

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 3.9.3.0

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

37 vulnerable

Vulnerable Software	Affected Versions
Cisco Secure Firewall Threat Defense	Version 7.2.0.1
Cisco Secure Firewall Threat Defense	Version 7.2.0
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 7.2.1
Cisco Secure Firewall Threat Defense	Version 7.2.2
Cisco Secure Firewall Threat Defense	Version 7.2.3
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 7.3.0
Cisco Secure Firewall Threat Defense	Version 7.3.1.1
Cisco Secure Firewall Threat Defense	Version 7.3.1.2
Cisco Secure Firewall Threat Defense	Version 7.3.1
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

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

Related CWEs

CWE-122

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (1)

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed

Source: psirt@cisco.com

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