🔐 CVE Alert

CVE-2026-20067

MEDIUM 5.8

Multiple Cisco Products Snort 3 TBD 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 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.  This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.

CWE CWE-787
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
7.0.0 7.0.0.1 7.0.1 7.1.0 7.0.1.1 7.1.0.1 7.0.2 7.2.0 7.0.2.1 7.0.3 7.1.0.2 7.2.0.1 7.0.4 7.2.1 7.0.5 7.3.0 7.2.2 7.2.3 7.3.1 7.1.0.3 7.2.4 7.0.6 7.2.5 7.2.4.1 7.3.1.1 7.4.0 7.0.6.1 7.2.5.1 7.4.1 7.2.6 7.0.6.2 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 7.0.6.3 7.4.2.1 7.2.9 7.0.7 7.7.0 7.4.2.2 7.2.10 7.6.1 7.4.2.3 7.0.8 7.6.2 7.7.10 7.0.8.1 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
17.3.1a 17.2.1r 17.3.2 17.4.1a 17.5.1 17.3.3 17.5.1a 17.3.4 17.3.4a 17.4.2 17.4.1b 17.6.1a 17.7.1a 17.6.2 17.8.1a 17.3.5 17.6.3 17.6.3a 17.7.2 17.9.1a 17.6.4 17.10.1a 17.3.6 17.3.7 17.9.2a 17.6.5 17.11.1a 17.9.3a 17.12.1a 17.9.4 17.6.6 17.3.8 17.3.8a 17.6.6a 17.9.4a 17.12.2 17.13.1a 17.9.5a 17.12.3 17.6.7 17.14.1a 17.12.4 17.12.3a 17.15.1a 17.6.8 17.9.6 17.6.8a 17.16.1a 17.9.5e 17.12.4a 17.15.2c 17.9.5f 17.12.4b 17.15.2a 17.12.5 17.17.1 17.12.5a 17.9.7a 17.15.3a 17.15.3 17.12.5b 17.12.5c 17.15.4 17.9.7b 17.18.1 17.18.1a 17.12.6 17.9.8 17.15.4c 17.12.5d 17.18.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz