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    CVE-2021-20285

    A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via a crafted ELF. The highest threat from this vulnerability is to system availability.

    Published:Mar 26, 2021
    Last Modified:Apr 11, 2025
    EPS:Mar 26, 2021
    EPSS Score:0.00237
    CVSS Score:6.6

    Affected Products

    Vendor
    Upx
    Product
    Upx

    Exploits

    https://github.com/upx/upx/issues/421https://github.com/upx/upx/issues/421

    Related CVEs

    CVE-2025-2849 (CVSS 4.8) — A vulnerability, which was classified as problematic, was found in UPX up to 5.0.0. Affected is the function P…
    CVE-2024-3209 (CVSS 5.5) — A vulnerability was found in UPX up to 4.2.2. It has been rated as critical. This issue affects the function g…
    CVE-2021-46179 (CVSS 6.5) — Reachable Assertion vulnerability in upx before 4.0.0 allows attackers to cause a denial of service via crafte…
    CVE-2021-43317 (CVSS 7.5) — A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an inaccessible …
    CVE-2021-43315 (CVSS 7.5) — A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an inaccessible …
    CVE-2021-43316 (CVSS 7.5) — A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an inaccessible a…
    CVE-2021-43312 (CVSS 7.5) — A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible add…
    CVE-2021-43311 (CVSS 7.5) — A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an inaccessible a…
    CVE-2021-43313 (CVSS 7.5) — A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible add…
    CVE-2021-43314 (CVSS 7.5) — A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an inaccessible …

    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