CVE-2026-20053

EUVD-2026-9459

04.03.2026, 18:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	5.8 MEDIUM	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Base Score

CVSS 3.x

EPSS Score

Percentile: 34.42%

Affected Products (NVD)

Vendor	Product	Version
cisco	snort	3.0.0-233 ≤ 𝑥 < 3.9.3.0
cisco	cyber_vision	3.0.0
cisco	cyber_vision	3.0.1
cisco	cyber_vision	3.0.2
cisco	cyber_vision	3.0.3
cisco	cyber_vision	3.0.4
cisco	cyber_vision	3.0.5
cisco	cyber_vision	3.0.6
cisco	cyber_vision	3.1.0
cisco	cyber_vision	3.1.1
cisco	cyber_vision	3.1.2
cisco	cyber_vision	3.2.0
cisco	cyber_vision	3.2.1
cisco	cyber_vision	3.2.2
cisco	cyber_vision	3.2.3
cisco	cyber_vision	3.2.4
cisco	cyber_vision	4.0.0
cisco	cyber_vision	4.0.1
cisco	cyber_vision	4.0.2
cisco	cyber_vision	4.0.3
cisco	cyber_vision	4.1.0
cisco	cyber_vision	4.1.1
cisco	cyber_vision	4.1.2
cisco	cyber_vision	4.1.3
cisco	cyber_vision	4.1.4
cisco	cyber_vision	4.1.5
cisco	cyber_vision	4.1.6
cisco	cyber_vision	4.1.7
cisco	cyber_vision	4.2.0
cisco	cyber_vision	4.2.1
cisco	cyber_vision	4.2.2
cisco	cyber_vision	4.2.3
cisco	cyber_vision	4.2.4
cisco	cyber_vision	4.2.6
cisco	cyber_vision	4.3.0
cisco	cyber_vision	4.3.1
cisco	cyber_vision	4.3.2
cisco	cyber_vision	4.3.3
cisco	cyber_vision	4.4.0
cisco	cyber_vision	4.4.1
cisco	cyber_vision	4.4.2
cisco	cyber_vision	4.4.3
cisco	cyber_vision	5.0.0
cisco	cyber_vision	5.0.1
cisco	cyber_vision	5.0.2
cisco	cyber_vision	5.1.0
cisco	cyber_vision	5.1.1
cisco	cyber_vision	5.1.2
cisco	cyber_vision	5.1.3
cisco	cyber_vision	5.2.0
cisco	cyber_vision	5.2.1
cisco	cyber_vision	5.3.0
cisco	cyber_vision	5.3.1
cisco	cyber_vision	5.3.2
cisco	secure_firewall_threat_defense	7.2.0
cisco	secure_firewall_threat_defense	7.2.0.1
cisco	secure_firewall_threat_defense	7.2.1
cisco	secure_firewall_threat_defense	7.2.2
cisco	secure_firewall_threat_defense	7.2.3
cisco	secure_firewall_threat_defense	7.2.4
cisco	secure_firewall_threat_defense	7.2.4.1
cisco	secure_firewall_threat_defense	7.2.5
cisco	secure_firewall_threat_defense	7.2.5.1
cisco	secure_firewall_threat_defense	7.2.5.2
cisco	secure_firewall_threat_defense	7.2.6
cisco	secure_firewall_threat_defense	7.2.7
cisco	secure_firewall_threat_defense	7.2.8
cisco	secure_firewall_threat_defense	7.2.8.1
cisco	secure_firewall_threat_defense	7.2.9
cisco	secure_firewall_threat_defense	7.2.10
cisco	secure_firewall_threat_defense	7.2.10.2
cisco	secure_firewall_threat_defense	7.3.0
cisco	secure_firewall_threat_defense	7.3.1
cisco	secure_firewall_threat_defense	7.3.1.1
cisco	secure_firewall_threat_defense	7.3.1.2
cisco	secure_firewall_threat_defense	7.4.0
cisco	secure_firewall_threat_defense	7.4.1
cisco	secure_firewall_threat_defense	7.4.1.1
cisco	secure_firewall_threat_defense	7.4.2
cisco	secure_firewall_threat_defense	7.4.2.1
cisco	secure_firewall_threat_defense	7.4.2.2
cisco	secure_firewall_threat_defense	7.4.2.3
cisco	secure_firewall_threat_defense	7.4.2.4
cisco	secure_firewall_threat_defense	7.4.3
cisco	secure_firewall_threat_defense	7.6.0
cisco	secure_firewall_threat_defense	7.6.1
cisco	secure_firewall_threat_defense	7.6.2
cisco	secure_firewall_threat_defense	7.6.2.1
cisco	secure_firewall_threat_defense	7.7.0
cisco	secure_firewall_threat_defense	7.7.10
cisco	secure_firewall_threat_defense	7.7.10.1
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.4
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.9.5e:e
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.1a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.2
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.3
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.3a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.4
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.4a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.4b:b
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5b:b
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5c:c
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.5d:d
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.12.6
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.13.1a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.14.1a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.1a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.2a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.2c:c
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.3
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.3a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.4
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.15.4c:c
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.16.1a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.17.1
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.18.1
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.18.1a:a
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.18.2

𝑥

= Vulnerable software versions

Common Weakness Enumeration

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

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