Vulnerability Monitor

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CVE-2026-20054

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 error checking when decompressing VBA data. 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 the Snort 3 Detection Engine to enter an infinite loop, causing a DoS condition.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and limited availability for affected systems. Impacting 4 products from cisco, from cisco, from cisco and 1 other, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2026-03-04T18:16:19.920

Last Modified

2026-08-20T15:19:41.873

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 5.8 (MEDIUM)

Weaknesses

Type: Secondary
CWE-835

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cisco	snort	< 3.9.3.0	Yes
Application	cisco	cyber_vision	3.0.0	Yes
Application	cisco	cyber_vision	3.0.1	Yes
Application	cisco	cyber_vision	3.0.2	Yes
Application	cisco	cyber_vision	3.0.3	Yes
Application	cisco	cyber_vision	3.0.4	Yes
Application	cisco	cyber_vision	3.0.5	Yes
Application	cisco	cyber_vision	3.0.6	Yes
Application	cisco	cyber_vision	3.1.0	Yes
Application	cisco	cyber_vision	3.1.1	Yes
Application	cisco	cyber_vision	3.1.2	Yes
Application	cisco	cyber_vision	3.2.0	Yes
Application	cisco	cyber_vision	3.2.1	Yes
Application	cisco	cyber_vision	3.2.2	Yes
Application	cisco	cyber_vision	3.2.3	Yes
Application	cisco	cyber_vision	3.2.4	Yes
Application	cisco	cyber_vision	4.0.0	Yes
Application	cisco	cyber_vision	4.0.1	Yes
Application	cisco	cyber_vision	4.0.2	Yes
Application	cisco	cyber_vision	4.0.3	Yes
Application	cisco	cyber_vision	4.1.0	Yes
Application	cisco	cyber_vision	4.1.1	Yes
Application	cisco	cyber_vision	4.1.2	Yes
Application	cisco	cyber_vision	4.1.3	Yes
Application	cisco	cyber_vision	4.1.4	Yes
Application	cisco	cyber_vision	4.1.5	Yes
Application	cisco	cyber_vision	4.1.6	Yes
Application	cisco	cyber_vision	4.1.7	Yes
Application	cisco	cyber_vision	4.2.0	Yes
Application	cisco	cyber_vision	4.2.1	Yes
Application	cisco	cyber_vision	4.2.2	Yes
Application	cisco	cyber_vision	4.2.3	Yes
Application	cisco	cyber_vision	4.2.4	Yes
Application	cisco	cyber_vision	4.2.6	Yes
Application	cisco	cyber_vision	4.3.0	Yes
Application	cisco	cyber_vision	4.3.1	Yes
Application	cisco	cyber_vision	4.3.2	Yes
Application	cisco	cyber_vision	4.3.3	Yes
Application	cisco	cyber_vision	4.4.0	Yes
Application	cisco	cyber_vision	4.4.1	Yes
Application	cisco	cyber_vision	4.4.2	Yes
Application	cisco	cyber_vision	4.4.3	Yes
Application	cisco	cyber_vision	5.0.0	Yes
Application	cisco	cyber_vision	5.0.1	Yes
Application	cisco	cyber_vision	5.0.2	Yes
Application	cisco	cyber_vision	5.1.0	Yes
Application	cisco	cyber_vision	5.1.1	Yes
Application	cisco	cyber_vision	5.1.2	Yes
Application	cisco	cyber_vision	5.1.3	Yes
Application	cisco	cyber_vision	5.2.0	Yes
Application	cisco	cyber_vision	5.2.1	Yes
Application	cisco	cyber_vision	5.3.0	Yes
Application	cisco	cyber_vision	5.3.1	Yes
Application	cisco	cyber_vision	5.3.2	Yes
Application	cisco	secure_firewall_threat_defense	7.2.0	Yes
Application	cisco	secure_firewall_threat_defense	7.2.0.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.2	Yes
Application	cisco	secure_firewall_threat_defense	7.2.3	Yes
Application	cisco	secure_firewall_threat_defense	7.2.4	Yes
Application	cisco	secure_firewall_threat_defense	7.2.4.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.5	Yes
Application	cisco	secure_firewall_threat_defense	7.2.5.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.5.2	Yes
Application	cisco	secure_firewall_threat_defense	7.2.6	Yes
Application	cisco	secure_firewall_threat_defense	7.2.7	Yes
Application	cisco	secure_firewall_threat_defense	7.2.8	Yes
Application	cisco	secure_firewall_threat_defense	7.2.8.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.9	Yes
Application	cisco	secure_firewall_threat_defense	7.2.10	Yes
Application	cisco	secure_firewall_threat_defense	7.2.10.2	Yes
Application	cisco	secure_firewall_threat_defense	7.3.0	Yes
Application	cisco	secure_firewall_threat_defense	7.3.1	Yes
Application	cisco	secure_firewall_threat_defense	7.3.1.1	Yes
Application	cisco	secure_firewall_threat_defense	7.3.1.2	Yes
Application	cisco	secure_firewall_threat_defense	7.4.0	Yes
Application	cisco	secure_firewall_threat_defense	7.4.1	Yes
Application	cisco	secure_firewall_threat_defense	7.4.1.1	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.2	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.3	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.4	Yes
Application	cisco	secure_firewall_threat_defense	7.4.3	Yes
Application	cisco	secure_firewall_threat_defense	7.6.0	Yes
Application	cisco	secure_firewall_threat_defense	7.6.1	Yes
Application	cisco	secure_firewall_threat_defense	7.6.2	Yes
Application	cisco	secure_firewall_threat_defense	7.6.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.7.0	Yes
Application	cisco	secure_firewall_threat_defense	7.7.10	Yes
Application	cisco	secure_firewall_threat_defense	7.7.10.1	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	3.17.0s	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	3.17.1s	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.1	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.7a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.9	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.10	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.7	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.8	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.1.1	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.2.1r	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.4a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.7	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.8	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.8a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.4.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.4.1b	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.4.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.5.1	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.5.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.3a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.6a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.7	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.8	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.6.8a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.7.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.7.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.8.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.2a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.3a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.4a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.5a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.5e	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.5f	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.7a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.7b	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.8	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.10.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.11.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.3a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.4a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.4b	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5b	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5c	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5d	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.13.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.14.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.2a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.2c	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.3a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.4c	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.16.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.17.1	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.18.1	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.18.1a	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.18.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	denali-16.3.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	denali-16.3.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	denali-16.3.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	denali-16.3.7	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	denali-16.3.9	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	everest-16.6.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	everest-16.6.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	everest-16.6.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.2	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.3	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.4	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.5	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.6	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.7	Yes
Operating System	cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	fuji-16.9.8	Yes

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed Vendor Advisory, Mitigation ([email protected])

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.