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    CVE-2025-40775

    When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

    Published:May 21, 2025
    Last Modified:Apr 15, 2026
    EPS:May 21, 2025
    EPSS Score:0.00181
    CVSS Score:7.5

    Affected Products

    Vendor
    Isc
    Product
    Bind 9

    Exploits

    https://github.com/AlexSvobo/nhi-zero-trust-bypass

    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