CVE-2021-40524

    Dashboard / Vulnerabilities / CVE-2021-40524

    CVE-2021-40524

    Published: 5 Sept 2021Last Modified: 9 Jul 2026

    Summary:

    Details: In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)

    References: https://lists.debian.org/debian-lts-announce/2025/11/msg00003.html, https://github.com/jedisct1/pure-ftpd/commit/37ad222868e52271905b94afea4fc780d83294b4, https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50, https://github.com/jedisct1/pure-ftpd/pull/158

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -868f0e2277e3f5890ca08c84d41de8065a7d8bc3

    Affected versions

    1.0.49
    1.0.48
    1.0.45
    1.0.44
    1.0.43
    1.0.41
    1.0.40
    1.0.39
    1.0.38
    1.0.37
    1.0.36
    1.0.35
    1.0.34
    1.0.33

    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
    CVE-2021-40524 | CVE-DB