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    CVE-2021-3998

    A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.

    Published:Jan 11, 2022
    Last Modified:Jun 9, 2025
    EPS:Aug 24, 2022
    EPSS Score:0.00114
    CVSS Score:7.5

    Affected Products

    Vendor
    Gnu
    Product
    Glibc
    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
    Ontap Select Deploy Administration Utility

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-80489 (CVSS 5.9) — A flaw was found in glibc. This vulnerability allows a remote attacker to cause a denial of service (DoS) by p…
    CVE-2026-77117 (CVSS 5.9) — A flaw was found in glibc. A remote attacker could exploit this vulnerability by providing specially crafted i…
    CVE-2026-19499 (CVSS 6.8) — A flaw was found in glibc. The strfmon and strfmon_l functions are vulnerable to a buffer overflow when proces…
    CVE-2026-19542 (CVSS 4.2) — A flaw was found in glibc. An out-of-bounds array write vulnerability exists within the `tdelete` function. Th…
    CVE-2026-6368 (CVSS 2.1) — Calling wordexp with WRDE_APPEND in the GNU C Library version 2.0 to version 2.43 can cause the interface to r…
    CVE-2026-6238 (CVSS 6.5) — The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2…
    CVE-2026-5435 (CVSS 7.3) — The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail…
    CVE-2026-5450 (CVSS 9.8) — Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 t…
    CVE-2026-5928 (CVSS 7.5) — Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlap…
    CVE-2026-4046 (CVSS 7.5) — The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when…

    References

    https://access.redhat.com/security/cve/CVE-2021-3998
    https://bugzilla.redhat.com/show_bug.cgi?id=2024633
    https://security-tracker.debian.org/tracker/CVE-2021-3998
    https://security.netapp.com/advisory/ntap-20221020-0003/
    https://sourceware.org/bugzilla/show_bug.cgi?id=28770
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=84d2d0fe20bdf94feed82b21b4d7d136db471f03
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=ee8d5e33adb284601c00c94687bc907e10aec9bb
    https://www.openwall.com/lists/oss-security/2022/01/24/4
    https://access.redhat.com/security/cve/CVE-2021-3998
    https://bugzilla.redhat.com/show_bug.cgi?id=2024633
    https://security-tracker.debian.org/tracker/CVE-2021-3998
    https://security.netapp.com/advisory/ntap-20221020-0003/
    https://sourceware.org/bugzilla/show_bug.cgi?id=28770
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=84d2d0fe20bdf94feed82b21b4d7d136db471f03
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=ee8d5e33adb284601c00c94687bc907e10aec9bb
    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