CVE-2026-20053
Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Heap Overflow Denial of Service Vulnerability
CVSS Score
5.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | cisco |
| Product | cisco cyber vision |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Mar 4, 2026 |
| Last Updated | Mar 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Cisco / Cisco Cyber Vision
3.0.0 3.0.2 3.0.3 3.0.1 3.1.0 3.0.4 3.1.1 3.1.2 3.2.0 3.0.5 3.2.1 3.0.6 3.2.2 3.2.3 3.2.4 4.0.0 4.0.1 4.0.2 4.0.3 4.1.0 4.1.1 4.1.2 4.1.3 4.1.4 4.2.0 4.2.1 4.1.5 4.2.2 4.2.X 4.2.3 4.2.4 4.2.6 4.1.6 4.3.0 4.3.1 4.3.2 4.3.3 4.4.0 4.4.1 4.4.2 4.4.3 4.1.7 5.0.0 5.0.1 5.0.2 5.1.0 5.1.1 5.1.2 5.1.3 5.2.0 5.2.1 5.3.0 5.3.1 5.3.2
Cisco / Cisco Secure Firewall Threat Defense (FTD) Software
7.2.0 7.2.0.1 7.2.1 7.3.0 7.2.2 7.2.3 7.3.1 7.2.4 7.2.5 7.2.4.1 7.3.1.1 7.4.0 7.2.5.1 7.4.1 7.2.6 7.4.1.1 7.2.7 7.2.5.2 7.3.1.2 7.2.8 7.6.0 7.4.2 7.2.8.1 7.4.2.1 7.2.9 7.7.0 7.4.2.2 7.2.10 7.6.1 7.4.2.3 7.6.2 7.7.10 7.6.2.1 7.7.10.1 7.4.2.4 7.2.10.2 7.4.3
Cisco / Cisco UTD SNORT IPS Engine Software
17.12.1a 17.9.4 17.12.2 17.13.1a 17.12.3 17.14.1a 17.12.4 17.12.3a 17.15.1a 17.16.1a 17.9.5e 17.12.4a 17.15.2c 17.12.4b 17.15.2a 17.12.5 17.17.1 17.12.5a 17.15.3a 17.15.3 17.12.5b 17.12.5c 17.15.4 17.18.1 17.18.1a 17.12.6 17.15.4c 17.12.5d 17.18.2