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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | unknown |
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Project Subscriptions
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Solution
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Workaround
No workaround given by the vendor.
Wed, 04 Mar 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Wed, 04 Mar 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Cisco Firepower Threat Defense Software and Cisco FirePOWER Services TLS with Snort 3 Denial of Service Vulnerability | |
| Weaknesses | CWE-388 | |
| References |
| |
| Metrics |
cvssV3_1
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Projects
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MITRE
Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2026-03-04T20:51:58.937Z
Reserved: 2025-10-08T11:59:15.349Z
Link: CVE-2026-20006
Vulnrichment
Updated: 2026-03-04T20:51:55.949Z
NVD
Status : Received
Published: 2026-03-04T18:16:13.803
Modified: 2026-03-04T18:16:13.803
Link: CVE-2026-20006
Redhat
No data.
OpenCVE Enrichment
No data.