CVE-2021-45955

    Dashboard / Vulnerabilities / CVE-2021-45955

    CVE-2021-45955

    Published: 1 Jan 2022Last Modified: 29 Jul 2025

    Summary:

    Details: Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c) because of the lack of a proper bounds check upon pseudo header re-insertion. NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge." However, a contributor states that a security patch (mentioned in 016162.html) is needed

    References: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898, https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml, https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html, https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html, https://security-tracker.debian.org/tracker/CVE-2021-45955

    Affected packages

    Package

    Name: dnsmasq

    Purl: pkg:deb/debian/dnsmasq?arch=source

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.85-1

    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-2021-45955 | CVE-DB