USN-7836-2

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    USN-7836-2

    Published: 12 Nov 2025Last Modified: 27 Apr 2026

    Summary: bind9 vulnerabilities

    Details: USN-7836-1 fixed vulnerabilities in Bind. This update provides the corresponding fixes for Ubuntu 20.04 LTS. Original advisory details: Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain malformed DNSKEY records. A remote attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of service. (CVE-2025-8677) Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind incorrectly accepted certain records from answers. A remote attacker could possibly use this issue to perform a cache poisoning attack. (CVE-2025-40778) Amit Klein and Omer Ben Simhon discovered that Bind used a weak PRNG. A remote attacker could possibly use this issue to perform a cache poisoning attack. (CVE-2025-40780)

    References: https://ubuntu.com/security/notices/USN-7836-2, https://ubuntu.com/security/CVE-2025-8677, https://ubuntu.com/security/CVE-2025-40778, https://ubuntu.com/security/CVE-2025-40780

    Affected packages

    Package

    Name: bind9

    Purl: pkg:deb/ubuntu/bind9@1:9.18.30-0ubuntu0.20.04.2+esm1?arch=source&distro=esm-infra/focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:9.18.30-0ubuntu0.20.04.2+esm1

    Affected versions

    1:9.11.5.P4+dfsg-5.1ubuntu2
    1:9.11.5.P4+dfsg-5.1ubuntu3
    1:9.11.5.P4+dfsg-5.1ubuntu4
    1:9.11.5.P4+dfsg-5.1ubuntu5
    1:9.11.14+dfsg-1ubuntu1
    1:9.11.14+dfsg-3ubuntu1

    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
    USN-7836-2 | CVE-DB