CVE-2026-20290
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Vulnerability report for CVE-2026-20290, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-16
Last updated on: 2026-09-18
Assigner: Cisco Systems, Inc.
Description
Description
A vulnerability in SSL/TLS certificate parsing in the Snort 2 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 2 Detection Engine to restart.
This vulnerability is due to incomplete validation of the SSL certificate. An attacker could exploit this vulnerability by sending a crafted SSL connection setup request to be parsed by Snort 2. A successful exploit could allow the attacker to cause the Snort 2 Detection Engine to restart unexpectedly, resulting in a denial of service (DoS) condition.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.0 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.0.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.1.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.0 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.2.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.3 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.0.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.4 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.5 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.3.0 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.3 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.3.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.4 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.6 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.5 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.4.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.3.1.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.0 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.6.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.5.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.6 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.6.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.1.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.7 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.5.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.3.1.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.8 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.6.0 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.8.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.6.3 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.2.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.9 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.7 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.2.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.10 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.6.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.2.3 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.8 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.6.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.8.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.6.2.1 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.2.4 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.10.2 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.3 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.6.4 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.4 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.0.9 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.2.11 |
| Cisco | Cisco | Secure Firewall Threat Defense (FTD) Software 7.4.7 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-805 | The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer. |
