MEDIUM
Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability
Published Mar 4, 2026
5.8
MEDIUMCVSS 3.1
EPSS 0.45%
Description
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.
Affected products
-
- Version 3.0.0StatusaffectedConstraints-
- Version 3.0.1StatusaffectedConstraints-
- Version 3.0.2StatusaffectedConstraints-
- Version 3.0.3StatusaffectedConstraints-
- Version 3.0.4StatusaffectedConstraints-
- Version 3.0.5StatusaffectedConstraints-
- Version 3.0.6StatusaffectedConstraints-
- Version 3.1.0StatusaffectedConstraints-
- Version 3.1.1StatusaffectedConstraints-
- Version 3.1.2StatusaffectedConstraints-
- Version 3.2.0StatusaffectedConstraints-
- Version 3.2.1StatusaffectedConstraints-
- Version 3.2.2StatusaffectedConstraints-
- Version 3.2.3StatusaffectedConstraints-
- Version 3.2.4StatusaffectedConstraints-
- Version 4.0.0StatusaffectedConstraints-
- Version 4.0.1StatusaffectedConstraints-
- Version 4.0.2StatusaffectedConstraints-
- Version 4.0.3StatusaffectedConstraints-
- Version 4.1.0StatusaffectedConstraints-
- Version 4.1.1StatusaffectedConstraints-
- Version 4.1.2StatusaffectedConstraints-
- Version 4.1.3StatusaffectedConstraints-
- Version 4.1.4StatusaffectedConstraints-
- Version 4.1.5StatusaffectedConstraints-
- Version 4.1.6StatusaffectedConstraints-
- Version 4.1.7StatusaffectedConstraints-
- Version 4.2.0StatusaffectedConstraints-
- Version 4.2.1StatusaffectedConstraints-
- Version 4.2.2StatusaffectedConstraints-
- Version 4.2.3StatusaffectedConstraints-
- Version 4.2.4StatusaffectedConstraints-
- Version 4.2.6StatusaffectedConstraints-
- Version 4.2.XStatusaffectedConstraints-
- Version 4.3.0StatusaffectedConstraints-
- Version 4.3.1StatusaffectedConstraints-
- Version 4.3.2StatusaffectedConstraints-
- Version 4.3.3StatusaffectedConstraints-
- Version 4.4.0StatusaffectedConstraints-
- Version 4.4.1StatusaffectedConstraints-
- Version 4.4.2StatusaffectedConstraints-
- Version 4.4.3StatusaffectedConstraints-
- Version 5.0.0StatusaffectedConstraints-
- Version 5.0.1StatusaffectedConstraints-
- Version 5.0.2StatusaffectedConstraints-
- Version 5.1.0StatusaffectedConstraints-
- Version 5.1.1StatusaffectedConstraints-
- Version 5.1.2StatusaffectedConstraints-
- Version 5.1.3StatusaffectedConstraints-
- Version 5.2.0StatusaffectedConstraints-
- Version 5.2.1StatusaffectedConstraints-
- Version 5.3.0StatusaffectedConstraints-
- Version 5.3.1StatusaffectedConstraints-
- Version 5.3.2StatusaffectedConstraints-
- Version
-
- Version 7.0.0StatusaffectedConstraints-
- Version 7.0.0.1StatusaffectedConstraints-
- Version 7.0.1StatusaffectedConstraints-
- Version 7.0.1.1StatusaffectedConstraints-
- Version 7.0.2StatusaffectedConstraints-
- Version 7.0.2.1StatusaffectedConstraints-
- Version 7.0.3StatusaffectedConstraints-
- Version 7.0.4StatusaffectedConstraints-
- Version 7.0.5StatusaffectedConstraints-
- Version 7.0.6StatusaffectedConstraints-
- Version 7.0.6.1StatusaffectedConstraints-
- Version 7.0.6.2StatusaffectedConstraints-
- Version 7.0.6.3StatusaffectedConstraints-
- Version 7.0.7StatusaffectedConstraints-
- Version 7.0.8StatusaffectedConstraints-
- Version 7.0.8.1StatusaffectedConstraints-
- Version 7.1.0StatusaffectedConstraints-
- Version 7.1.0.1StatusaffectedConstraints-
- Version 7.1.0.2StatusaffectedConstraints-
- Version 7.1.0.3StatusaffectedConstraints-
- Version 7.2.0StatusaffectedConstraints-
- Version 7.2.0.1StatusaffectedConstraints-
- Version 7.2.1StatusaffectedConstraints-
- Version 7.2.10StatusaffectedConstraints-
- Version 7.2.10.2StatusaffectedConstraints-
- Version 7.2.2StatusaffectedConstraints-
- Version 7.2.3StatusaffectedConstraints-
- Version 7.2.4StatusaffectedConstraints-
- Version 7.2.4.1StatusaffectedConstraints-
- Version 7.2.5StatusaffectedConstraints-
- Version 7.2.5.1StatusaffectedConstraints-
- Version 7.2.5.2StatusaffectedConstraints-
- Version 7.2.6StatusaffectedConstraints-
- Version 7.2.7StatusaffectedConstraints-
- Version 7.2.8StatusaffectedConstraints-
- Version 7.2.8.1StatusaffectedConstraints-
- Version 7.2.9StatusaffectedConstraints-
- Version 7.3.0StatusaffectedConstraints-
- Version 7.3.1StatusaffectedConstraints-
- Version 7.3.1.1StatusaffectedConstraints-
- Version 7.3.1.2StatusaffectedConstraints-
- Version 7.4.0StatusaffectedConstraints-
- Version 7.4.1StatusaffectedConstraints-
- Version 7.4.1.1StatusaffectedConstraints-
- Version 7.4.2StatusaffectedConstraints-
- Version 7.4.2.1StatusaffectedConstraints-
- Version 7.4.2.2StatusaffectedConstraints-
- Version 7.4.2.3StatusaffectedConstraints-
- Version 7.4.2.4StatusaffectedConstraints-
- Version 7.4.3StatusaffectedConstraints-
- Version 7.6.0StatusaffectedConstraints-
- Version 7.6.1StatusaffectedConstraints-
- Version 7.6.2StatusaffectedConstraints-
- Version 7.6.2.1StatusaffectedConstraints-
- Version 7.7.0StatusaffectedConstraints-
- Version 7.7.10StatusaffectedConstraints-
- Version 7.7.10.1StatusaffectedConstraints-
- Version
-
- Version 17.10.1aStatusaffectedConstraints-
- Version 17.11.1aStatusaffectedConstraints-
- Version 17.12.1aStatusaffectedConstraints-
- Version 17.12.2StatusaffectedConstraints-
- Version 17.12.3StatusaffectedConstraints-
- Version 17.12.3aStatusaffectedConstraints-
- Version 17.12.4StatusaffectedConstraints-
- Version 17.12.4aStatusaffectedConstraints-
- Version 17.12.4bStatusaffectedConstraints-
- Version 17.12.5StatusaffectedConstraints-
- Version 17.12.5aStatusaffectedConstraints-
- Version 17.12.5bStatusaffectedConstraints-
- Version 17.12.5cStatusaffectedConstraints-
- Version 17.12.5dStatusaffectedConstraints-
- Version 17.12.6StatusaffectedConstraints-
- Version 17.13.1aStatusaffectedConstraints-
- Version 17.14.1aStatusaffectedConstraints-
- Version 17.15.1aStatusaffectedConstraints-
- Version 17.15.2aStatusaffectedConstraints-
- Version 17.15.2cStatusaffectedConstraints-
- Version 17.15.3StatusaffectedConstraints-
- Version 17.15.3aStatusaffectedConstraints-
- Version 17.15.4StatusaffectedConstraints-
- Version 17.15.4cStatusaffectedConstraints-
- Version 17.16.1aStatusaffectedConstraints-
- Version 17.17.1StatusaffectedConstraints-
- Version 17.18.1StatusaffectedConstraints-
- Version 17.18.1aStatusaffectedConstraints-
- Version 17.18.2StatusaffectedConstraints-
- Version 17.2.1rStatusaffectedConstraints-
- Version 17.3.1aStatusaffectedConstraints-
- Version 17.3.2StatusaffectedConstraints-
- Version 17.3.3StatusaffectedConstraints-
- Version 17.3.4StatusaffectedConstraints-
- Version 17.3.4aStatusaffectedConstraints-
- Version 17.3.5StatusaffectedConstraints-
- Version 17.3.6StatusaffectedConstraints-
- Version 17.3.7StatusaffectedConstraints-
- Version 17.3.8StatusaffectedConstraints-
- Version 17.3.8aStatusaffectedConstraints-
- Version 17.4.1aStatusaffectedConstraints-
- Version 17.4.1bStatusaffectedConstraints-
- Version 17.4.2StatusaffectedConstraints-
- Version 17.5.1StatusaffectedConstraints-
- Version 17.5.1aStatusaffectedConstraints-
- Version 17.6.1aStatusaffectedConstraints-
- Version 17.6.2StatusaffectedConstraints-
- Version 17.6.3StatusaffectedConstraints-
- Version 17.6.3aStatusaffectedConstraints-
- Version 17.6.4StatusaffectedConstraints-
- Version 17.6.5StatusaffectedConstraints-
- Version 17.6.6StatusaffectedConstraints-
- Version 17.6.6aStatusaffectedConstraints-
- Version 17.6.7StatusaffectedConstraints-
- Version 17.6.8StatusaffectedConstraints-
- Version 17.6.8aStatusaffectedConstraints-
- Version 17.7.1aStatusaffectedConstraints-
- Version 17.7.2StatusaffectedConstraints-
- Version 17.8.1aStatusaffectedConstraints-
- Version 17.9.1aStatusaffectedConstraints-
- Version 17.9.2aStatusaffectedConstraints-
- Version 17.9.3aStatusaffectedConstraints-
- Version 17.9.4StatusaffectedConstraints-
- Version 17.9.4aStatusaffectedConstraints-
- Version 17.9.5aStatusaffectedConstraints-
- Version 17.9.5eStatusaffectedConstraints-
- Version 17.9.5fStatusaffectedConstraints-
- Version 17.9.6StatusaffectedConstraints-
- Version 17.9.7aStatusaffectedConstraints-
- Version 17.9.7bStatusaffectedConstraints-
- Version 17.9.8StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Cyber Vision | n/a |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | n/a |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cisco | Cisco UTD SNORT IPS Engine Software | n/a |
|
Configuration 2
OR
- 3.0.0
- 3.0.1
- 3.0.2
- 3.0.3
- 3.0.4
- 3.0.5
- 3.0.6
- 3.1.0
- 3.1.1
- 3.1.2
- 3.2.0
- 3.2.1
- 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
- 4.1.5
- 4.1.6
- 4.1.7
- 4.2.0
- 4.2.1
- 4.2.2
- 4.2.3
- 4.2.4
- 4.2.6
- 4.3.0
- 4.3.1
- 4.3.2
- 4.3.3
- 4.4.0
- 4.4.1
- 4.4.2
- 4.4.3
- 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
Configuration 3
OR
- 7.0.0
- 7.0.0.1
- 7.0.1
- 7.0.1.1
- 7.0.2
- 7.0.2.1
- 7.0.3
- 7.0.4
- 7.0.5
- 7.0.6
- 7.0.6.1
- 7.0.6.2
- 7.0.6.3
- 7.0.7
- 7.0.8
- 7.0.8.1
- 7.1.0
- 7.1.0.1
- 7.1.0.2
- 7.1.0.3
- 7.2.0
- 7.2.0.1
- 7.2.1
- 7.2.2
- 7.2.3
- 7.2.4
- 7.2.4.1
- 7.2.5
- 7.2.5.1
- 7.2.5.2
- 7.2.6
- 7.2.7
- 7.2.8
- 7.2.8.1
- 7.2.9
- 7.2.10
- 7.2.10.2
- 7.3.0
- 7.3.1
- 7.3.1.1
- 7.3.1.2
- 7.4.0
- 7.4.1
- 7.4.1.1
- 7.4.2
- 7.4.2.1
- 7.4.2.2
- 7.4.2.3
- 7.4.2.4
- 7.4.3
- 7.6.0
- 7.6.1
- 7.6.2
- 7.6.2.1
- 7.7.0
- 7.7.10
- 7.7.10.1
Configuration 4
OR
- 17.2.1r
- 17.3.1a
- 17.3.2
- 17.3.3
- 17.3.4
- 17.3.4a
- 17.3.5
- 17.3.6
- 17.3.7
- 17.3.8
- 17.3.8a
- 17.4.1a
- 17.4.1b
- 17.4.2
- 17.5.1
- 17.5.1a
- 17.6.1a
- 17.6.2
- 17.6.3
- 17.6.3a
- 17.6.4
- 17.6.5
- 17.6.6
- 17.6.6a
- 17.6.7
- 17.6.8
- 17.6.8a
- 17.7.1a
- 17.7.2
- 17.8.1a
- 17.9.1a
- 17.9.2a
- 17.9.3a
- 17.9.4
- 17.9.4a
- 17.9.5a
- 17.9.5e
- 17.9.5f
- 17.9.6
- 17.9.7a
- 17.9.7b
- 17.9.8
- 17.10.1a
- 17.11.1a
- 17.12.1a
- 17.12.2
- 17.12.3
- 17.12.3a
- 17.12.4
- 17.12.4a
- 17.12.4b
- 17.12.5
- 17.12.5a
- 17.12.5b
- 17.12.5c
- 17.12.5d
- 17.12.6
- 17.13.1a
- 17.14.1a
- 17.15.1a
- 17.15.2a
- 17.15.2c
- 17.15.3
- 17.15.3a
- 17.15.4
- 17.15.4c
- 17.16.1a
- 17.17.1
- 17.18.1
- 17.18.1a
- 17.18.2
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
5.8 MEDIUM CVE.org
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 Impact None
Integrity Impact None
Availability Impact Low
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Mar 4, 2026 · SSVC 2.0.3
0.45% 0.00454
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00454
Score over time
Mar–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.45% (0.00454) | 37.12th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.47% (0.00475) | 37.11th | v5 (v2026.06.15) |
| Mar 5, 2026 | 0.10% (0.00096) | 26.61th | v4 (v2025.03.14) |
Weaknesses (1)
References (1)
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Mar 4, 2026
Updated Mar 4, 2026
Reserved Oct 8, 2025
Link CVE-2026-20067
CISA Vulnrichment
Updated Mar 4, 2026