Cisco Firepower Threat Defense Software and Cisco FirePOWER Services TLS with Snort 3 Denial of Service Vulnerability
Published Mar 4, 2026
5.8
MEDIUMCVSS 3.1
EPSS 0.37%
Description
A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a denial of service (DoS) condition. This vulnerability is due to improper implementation of the TLS protocol. An attacker could exploit this vulnerability by sending a crafted TLS packet to an affected system. A successful exploit could allow the attacker to cause a device that is running Cisco Secure FTD Software to drop network traffic, resulting in a DoS condition. Note: TLS 1.3 is not affected by this vulnerability.
Affected products
-
- 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 7.6.0StatusaffectedConstraints-
- Version 7.6.1StatusaffectedConstraints-
- Version 7.6.2StatusaffectedConstraints-
- Version 7.6.2.1StatusaffectedConstraints-
- 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 Secure Firewall Threat Defense (FTD) Software | n/a |
|
- 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
- 7.6.0
- 7.6.1
- 7.6.2
- 7.6.2.1
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
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
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 | 0.37% (0.00373) | 28.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.37% (0.00373) | 28.87th | v5 (v2026.06.15) |
| Mar 5, 2026 | 0.09% (0.00094) | 26.13th | v4 (v2025.03.14) |
References (1)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-rHfqnwRg Vendor AdvisoryMitigation
| Link | Providers | Tags |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-rHfqnwRg | Vendor AdvisoryMitigation |
Change history (0)
No recorded changes yet.