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    CVE-2006-6164

    The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables, which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes, which might be leveraged to gain privileges.

    Published:Nov 29, 2006
    Last Modified:Apr 23, 2026
    EPS:Nov 29, 2006
    EPSS Score:0.00047
    CVSS Score:7.2

    Affected Products

    Vendor
    Openbsd
    Product
    Openbsd

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    CVE-2026-55706 (CVSS 5.8) — sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zer…
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    CVE-2025-30334 (CVSS 7.1) — In OpenBSD 7.6 before errata 006 and OpenBSD 7.5 before errata 015, traffic sent over wg(4) could result in ke…
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    References

    http://secunia.com/advisories/22993
    http://securitytracker.com/id?1017253
    http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/
    http://www.openbsd.org/errata.html#ldso
    http://www.openbsd.org/errata39.html#ldso
    http://www.securityfocus.com/archive/1/452371/100/0/threaded
    http://www.securityfocus.com/archive/1/452428/100/0/threaded
    http://www.securityfocus.com/bid/21188
    https://exchange.xforce.ibmcloud.com/vulnerabilities/30441
    http://secunia.com/advisories/22993
    http://securitytracker.com/id?1017253
    http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/
    http://www.openbsd.org/errata.html#ldso
    http://www.openbsd.org/errata39.html#ldso
    http://www.securityfocus.com/archive/1/452371/100/0/threaded
    http://www.securityfocus.com/archive/1/452428/100/0/threaded
    http://www.securityfocus.com/bid/21188
    https://exchange.xforce.ibmcloud.com/vulnerabilities/30441

    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