Denial of Service Vulnerability in Cisco Snort 3 Detection Engine
CVE-2026-20067

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-2026-20067?

Multiple Cisco products are impacted by a vulnerability in the Snort 3 detection engine that may allow an unauthenticated remote attacker to interrupt packet inspection. This issue arises from insufficient error checking during the parsing of Multicast DNS fields in the HTTP header. By sending specially crafted HTTP packets through an established connection, an attacker could exploit this vulnerability, leading to an unexpected restart of the Snort 3 Detection Engine and resulting in a denial of service condition.

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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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