# CVE-2026-20005

## Summary

- **CVE ID:** CVE-2026-20005
- **Severity:** MEDIUM
- **CVSS Score:** 5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L)
- **CWE:** CWE-392
- **Published:** Mar 4, 2026
- **Last Modified:** Mar 12, 2026

## 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 parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.

## Affected Products

- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.6.0)
- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.6.1)
- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.6.2)
- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.6.2.1)
- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.7.0)
- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.7.10)
- Cisco — Cisco Secure Firewall Threat Defense (FTD) Software (7.7.10.1)
- Cisco — Cisco Cyber Vision (3.0.4)
- Cisco — Cisco Cyber Vision (3.0.0)
- Cisco — Cisco Cyber Vision (3.0.1)
- Cisco — Cisco Cyber Vision (3.0.2)
- Cisco — Cisco Cyber Vision (3.0.3)
- Cisco — Cisco Cyber Vision (3.0.5)
- Cisco — Cisco Cyber Vision (3.0.6)
- Cisco — Cisco Cyber Vision (3.1.0)
- Cisco — Cisco Cyber Vision (3.1.2)
- Cisco — Cisco Cyber Vision (3.1.1)
- Cisco — Cisco Cyber Vision (3.2.3)
- Cisco — Cisco Cyber Vision (3.2.1)
- Cisco — Cisco Cyber Vision (3.2.4)
- Cisco — Cisco Cyber Vision (3.2.0)
- Cisco — Cisco Cyber Vision (3.2.2)
- Cisco — Cisco Cyber Vision (4.0.0)
- Cisco — Cisco Cyber Vision (4.0.1)
- Cisco — Cisco Cyber Vision (4.0.2)
- Cisco — Cisco Cyber Vision (4.0.3)
- Cisco — Cisco Cyber Vision (4.1.0)
- Cisco — Cisco Cyber Vision (4.1.1)
- Cisco — Cisco Cyber Vision (4.1.2)
- Cisco — Cisco Cyber Vision (4.1.3)
- Cisco — Cisco Cyber Vision (4.1.4)
- Cisco — Cisco Cyber Vision (4.1.5)
- Cisco — Cisco Cyber Vision (4.1.6)
- Cisco — Cisco Cyber Vision (4.1.7)
- Cisco — Cisco Cyber Vision (4.2.0)
- Cisco — Cisco Cyber Vision (4.2.1)
- Cisco — Cisco Cyber Vision (4.2.4)
- Cisco — Cisco Cyber Vision (4.2.6)
- Cisco — Cisco Cyber Vision (4.2.2)
- Cisco — Cisco Cyber Vision (4.2.3)
- Cisco — Cisco Cyber Vision (4.3.0)
- Cisco — Cisco Cyber Vision (4.3.1)
- Cisco — Cisco Cyber Vision (4.3.2)
- Cisco — Cisco Cyber Vision (4.3.3)
- Cisco — Cisco Cyber Vision (4.4.0)
- Cisco — Cisco Cyber Vision (4.4.1)
- Cisco — Cisco Cyber Vision (4.4.2)
- Cisco — Cisco Cyber Vision (4.4.3)
- Cisco — Cisco Cyber Vision (5.0.0)
- Cisco — Cisco Cyber Vision (5.0.1)
- Cisco — Cisco Cyber Vision (5.0.2)
- Cisco — Cisco Cyber Vision (5.1.1)
- Cisco — Cisco Cyber Vision (5.1.2)
- Cisco — Cisco Cyber Vision (5.1.3)
- Cisco — Cisco Cyber Vision (5.2.0)
- Cisco — Cisco Cyber Vision (5.2.1)
- Cisco — Cisco Cyber Vision (5.3.0)
- Cisco — Cisco Cyber Vision (5.3.1)
- Cisco — Cisco Cyber Vision (5.3.2)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.2.1r)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.2)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.3)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.4a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.6)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.5)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.7)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.3.8)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.4.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.4.2)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.4.1b)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.5.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.2)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.3a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.4)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.5)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.6)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.7)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.6.8a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.7.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.7.2)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.10.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.2a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.3a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.4)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.5a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.6)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.5e)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.5f)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.7a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.8)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.9.7b)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.8.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.11.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.2)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.3)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.4)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.4a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.4b)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.5)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.5a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.5b)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.5c)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.6)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.12.5d)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.13.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.14.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.2a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.2c)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.3)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.3a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.4)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.15.4c)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.16.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.17.1)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.18.1a)
- Cisco — Cisco UTD SNORT IPS Engine Software (17.18.2)

## References

- [CNA](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.49%
- **EPSS Percentile:** 40.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._