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    CVE-2022-20685

    A vulnerability in the Modbus preprocessor of the Snort detection engine could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an integer overflow while processing Modbus traffic. An attacker could exploit this vulnerability by sending crafted Modbus traffic through an affected device. A successful exploit could allow the attacker to cause the Snort process to hang, causing traffic inspection to stop.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

    Published:Nov 15, 2024
    Last Modified:Aug 11, 2026
    EPS:Nov 15, 2024
    EPSS Score:0.01386
    CVSS Score:7.5

    Affected Products

    Vendor
    Cisco
    Product
    Cyber Vision
    Vendor
    Cisco
    Product
    Secure Firewall Threat Defense
    Vendor
    Cisco
    Product
    Unified Threat Defense Snort Intrusion Prevention System Engine

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

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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