Denial of Service Vulnerability in Snort 3 by Cisco
CVE-2026-20057

5.8MEDIUM

Key Information:

Vendor

Cisco
Status
Cisco Cyber Vision
Cisco Secure Firewall Threat Defense (ftd) Software
Cisco Utd Snort Ips Engine Software
Vendor
CVE Published:
4 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20057?

Cisco's Snort 3 is susceptible to a vulnerability in its Visual Basic for Applications (VBA) feature, allowing remote unauthenticated attackers to potentially crash the Snort 3 Detection Engine. This vulnerability arises due to inadequate error handling during the decompression of VBA data. An attacker can exploit this weakness by sending maliciously crafted VBA data, leading to unexpected restarts of the Snort 3 Detection Engine and creating a denial of service (DoS) condition on affected devices.

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Affected Version(s)

Cisco Cyber Vision 3.0.0

Cisco Cyber Vision 3.0.2

Cisco Cyber Vision 3.0.3

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
5.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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