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CVE-2026-20057

Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Denial of Service Vulnerability

Published: Mar 4, 2026Updated: Mar 5, 2026 Sources: CVE List NVDCWE-369
NVD MITRE
5.8CVSSMEDIUM
EPSS Score
0.4%
Top 65.6%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available

Description

Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.    This vulnerability is due to lack of proper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending a 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 unexpectedly restart causing a a denial of service (DoS) condition.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-369

Affected Products

Cisco Cyber VisionCiscoNetworking Infrastructure
Cisco Secure Firewall Threat Defense (FTD) SoftwareCiscoNetworking Infrastructure
Cisco UTD SNORT IPS Engine SoftwareCiscoNetworking Infrastructure
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details

References

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

Timeline

Published
Mar 4, 2026
Last Updated
Mar 5, 2026

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