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    CVE-2021-43523

    In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications (leading to remote code execution, XSS, applications crashes, etc.). In other words, a validation step, which is expected in any stub resolver, does not occur.

    Published:Nov 10, 2021
    Last Modified:May 5, 2025
    EPS:Nov 10, 2021
    EPSS Score:0.0239
    CVSS Score:9.6

    Affected Products

    Vendor
    Uclibc
    Product
    Uclibc
    Vendor
    Uclibc-ng Project
    Product
    Uclibc-ng

    Exploits

    https://www.openwall.com/lists/oss-security/2021/11/09/1https://www.openwall.com/lists/oss-security/2021/11/09/1

    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