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    CVE-2021-20294

    A flaw was found in binutils readelf 2.35 program. An attacker who is able to convince a victim using readelf to read a crafted file could trigger a stack buffer overflow, out-of-bounds write of arbitrary data supplied by the attacker. The highest impact of this flaw is to confidentiality, integrity, and availability.

    Published:Nov 21, 2020
    Last Modified:Nov 21, 2024
    EPS:Apr 29, 2021
    EPSS Score:0.19156
    CVSS Score:7.8

    Affected Products

    Vendor
    Gnu
    Product
    Binutils

    Exploits

    https://sourceware.org/bugzilla/show_bug.cgi?id=26929https://sourceware.org/bugzilla/show_bug.cgi?id=26929https://github.com/tin-z/CVE-2021-20294-POC

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-19582 — Red Hat Product Security has come to the conclusion that this CVE is false due to upstream security policy.…
    CVE-2026-19548 (CVSS 5.5) — Multiple Use-After-Free vulnerabilities were found in the add_archive_element function in ld/ldmain.c of the G…
    CVE-2026-18220 (CVSS 7.8) — An out-of-bounds write vulnerability was found in the BFD library's DLX ELF backend (bfd/elf32-dlx.c) in GNU b…
    CVE-2026-15003 (CVSS 5.6) — A flaw was found in the GNU Binutils (Binary Utilities) linker. This vulnerability, a heap-buffer-overflow rea…
    CVE-2026-6845 (CVSS 5) — A flaw was found in binutils, specifically within the `readelf` utility. This vulnerability allows a local att…
    CVE-2026-6844 (CVSS 5.5) — A flaw was found in the `readelf` utility of the binutils package. A local attacker could exploit two Denial o…
    CVE-2026-6846 (CVSS 7.8) — A flaw was found in binutils. A heap-buffer-overflow vulnerability exists when processing a specially crafted …
    CVE-2026-4647 (CVSS 6.1) — A flaw was found in the GNU Binutils BFD library, a widely used component for handling binary files such as ob…
    CVE-2025-69648 (CVSS 6.2) — GNU Binutils thru 2.45.1 readelf contains a denial-of-service vulnerability when processing a crafted binary w…
    CVE-2025-69647 (CVSS 6.2) — GNU Binutils thru 2.45.1 readelf contains a denial-of-service vulnerability when processing a crafted binary w…

    References

    https://bugzilla.redhat.com/show_bug.cgi?id=1943533
    https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    https://security.gentoo.org/glsa/202208-30
    https://sourceware.org/bugzilla/show_bug.cgi?id=26929
    https://sourceware.org/git/?p=binutils-gdb.git%3Ba=patch%3Bh=372dd157272e0674d13372655cc60eaca9c06926
    https://bugzilla.redhat.com/show_bug.cgi?id=1943533
    https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    https://security.gentoo.org/glsa/202208-30
    https://sourceware.org/bugzilla/show_bug.cgi?id=26929
    https://sourceware.org/git/?p=binutils-gdb.git%3Ba=patch%3Bh=372dd157272e0674d13372655cc60eaca9c06926

    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