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    CVE-2026-20005

    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.

    Published:Mar 4, 2026
    Last Modified:Sep 1, 2026
    EPS:Mar 4, 2026
    EPSS Score:0.0049
    CVSS Score:5.8

    Affected Products

    Vendor
    Cisco
    Product
    Cisco Utd Snort Ips Engine Software
    Vendor
    Cisco
    Product
    Cyber Vision
    Vendor
    Cisco
    Product
    Meraki Mx100
    Vendor
    Cisco
    Product
    Meraki Mx105
    Vendor
    Cisco
    Product
    Meraki Mx250
    Vendor
    Cisco
    Product
    Meraki Mx400
    Vendor
    Cisco
    Product
    Meraki Mx450
    Vendor
    Cisco
    Product
    Meraki Mx600
    Vendor
    Cisco
    Product
    Meraki Mx64
    Vendor
    Cisco
    Product
    Meraki Mx64w
    Vendor
    Cisco
    Product
    Meraki Mx65
    Vendor
    Cisco
    Product
    Meraki Mx65w
    Vendor
    Cisco
    Product
    Meraki Mx67
    Vendor
    Cisco
    Product
    Meraki Mx67c
    Vendor
    Cisco
    Product
    Meraki Mx67w
    Vendor
    Cisco
    Product
    Meraki Mx68
    Vendor
    Cisco
    Product
    Meraki Mx68cw
    Vendor
    Cisco
    Product
    Meraki Mx75
    Vendor
    Cisco
    Product
    Meraki Mx84
    Vendor
    Cisco
    Product
    Meraki Mx85
    Vendor
    Cisco
    Product
    Meraki Mx95
    Vendor
    Cisco
    Product
    Secure Firewall Threat Defense
    Vendor
    Cisco
    Product
    Snort
    Vendor
    Cisco
    Product
    Unified Threat Defense Snort Intrusion Prevention System Engine

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High