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    CVE-2021-3999

    A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.

    Published:Jan 11, 2022
    Last Modified:Dec 2, 2025
    EPS:Aug 24, 2022
    EPSS Score:0.01019
    CVSS Score:7.8

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Gnu
    Product
    Glibc
    Vendor
    Netapp
    Product
    E-series Performance Analyzer
    Vendor
    Netapp
    Product
    H300s
    Vendor
    Netapp
    Product
    H300s Firmware
    Vendor
    Netapp
    Product
    H410c
    Vendor
    Netapp
    Product
    H410c Firmware
    Vendor
    Netapp
    Product
    H410s
    Vendor
    Netapp
    Product
    H410s Firmware
    Vendor
    Netapp
    Product
    H500s
    Vendor
    Netapp
    Product
    H500s Firmware
    Vendor
    Netapp
    Product
    H700s
    Vendor
    Netapp
    Product
    H700s Firmware
    Vendor
    Netapp
    Product
    Nfs Plug-in
    Vendor
    Netapp
    Product
    Ontap Select Deploy Administration Utility
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://www.openwall.com/lists/oss-security/2022/01/24/4https://www.openwall.com/lists/oss-security/2022/01/24/4

    Common Weakness Enumeration

    CWE-193 Off-by-one Error

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://access.redhat.com/security/cve/CVE-2021-3999
    https://bugzilla.redhat.com/show_bug.cgi?id=2024637
    https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
    https://security-tracker.debian.org/tracker/CVE-2021-3999
    https://security.netapp.com/advisory/ntap-20221104-0001/
    https://sourceware.org/bugzilla/show_bug.cgi?id=28769
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
    https://www.openwall.com/lists/oss-security/2022/01/24/4
    https://access.redhat.com/security/cve/CVE-2021-3999
    https://bugzilla.redhat.com/show_bug.cgi?id=2024637
    https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
    https://security-tracker.debian.org/tracker/CVE-2021-3999
    https://security.netapp.com/advisory/ntap-20221104-0001/
    https://sourceware.org/bugzilla/show_bug.cgi?id=28769
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
    https://www.openwall.com/lists/oss-security/2022/01/24/4

    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