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    CVE-2025-40778

    Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

    Published:Oct 22, 2025
    Last Modified:Apr 15, 2026
    EPS:Oct 22, 2025
    EPSS Score:0.00005
    CVSS Score:8.6

    Affected Products

    Vendor
    Isc
    Product
    Bind 9

    Exploits

    https://github.com/nehkark/CVE-2025-40778https://github.com/nicholasC03/DNS-Poisoning-Triage-Labhttps://github.com/sirbuvladste/BIND-9-Cache-Poisoning-PoC---CVE-2025-40778

    Related CVEs

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    CVE-2026-5946 (CVSS 7.5) — Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Inte…
    CVE-2025-40780 (CVSS 8.6) — In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is …
    CVE-2025-8677 (CVSS 7.5) — Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to C…
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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