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    CVE-2026-20236

    As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20236 are related to issues concerning incorrect calculation that are grouped under the Common Weakness Enumeration (CWE) Base CWE-682.

    Published:Oct 21, 2026
    Last Modified:Oct 22, 2026
    EPS:Oct 21, 2026
    EPSS Score:0.00346
    CVSS Score:7.5

    Affected Products

    Vendor
    Cisco
    Product
    Cisco Open Source Snort3
    Vendor
    Cisco
    Product
    Cisco Secure Firewall Threat Defense (ftd) Software
    Vendor
    Cisco
    Product
    Cisco Utd Snort Ips Engine Software
    Vendor
    Cisco
    Product
    Cyber Vision
    Vendor
    Cisco
    Product
    Secure Firewall Threat Defense

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-682 Incorrect Calculation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-128 Integer Attacks
    CAPEC-129 Pointer Manipulation

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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
    CVE-2026-20236 — Cisco (High 7.5) | CVE-DB