CVE-2026-20005

MEDIUM

5.8

CVSS Score

Published: March 4, 2026 at 05:02 PM UTC

Updated: September 1, 2026 at 07:51 PM UTC

23 products affected across 1 vendorSecure Firewall Threat DefenseUnified Threat Defense Snort Intrusion Prevention System EngineCisco Cyber Vision

Using Cisco Cyber Vision by Cisco?

Get instant alerts when new vulnerabilities affect Cisco Cyber Vision - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.8

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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 by the Snort 3 Detection Engine. 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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Secure Firewall Threat Defense · Cisco

95%

7.6.0 7.6.1 7.6.2 7.6.2.1 7.7.0 7.7.10 7.7.10.1

Snort++· Cisco

95%

3.0.0-233 ≤ v < 3.9.2.0

Affected range stops below 3.9.2.0, so it looks safe — our inference, not a vendor statement

cisco-meraki-mx100 (environment) · cisco-meraki-mx105 (environment) · cisco-meraki-mx250 (environment) · cisco-meraki-mx400 (environment) · cisco-meraki-mx450 (environment) · cisco-meraki-mx600 (environment) · cisco-meraki-mx64 (environment) · cisco-meraki-mx64w (environment) · cisco-meraki-mx65 (environment) · cisco-meraki-mx65w (environment) · cisco-meraki-mx67 (environment) · cisco-meraki-mx67c (environment) · cisco-meraki-mx67w (environment) · cisco-meraki-mx68 (environment) · cisco-meraki-mx68cw (environment) · cisco-meraki-mx75 (environment) · cisco-meraki-mx84 (environment) · cisco-meraki-mx85 (environment) · cisco-meraki-mx95 (environment)