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    CVE-2021-40524

    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.)

    Published:Sep 5, 2021
    Last Modified:Nov 4, 2025
    EPS:Sep 5, 2021
    EPSS Score:0.21104
    CVSS Score:7.5

    Affected Products

    Vendor
    Pureftpd
    Product
    Pure-ftpd

    Exploits

    https://github.com/jedisct1/pure-ftpd/pull/158https://github.com/jedisct1/pure-ftpd/pull/158

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs

    Related CVEs

    CVE-2024-48208 (CVSS 8.6) — pure-ftpd before 1.0.52 is vulnerable to Buffer Overflow. There is an out of bounds read in the domlsd() funct…
    CVE-2020-35359 (CVSS 7.5) — Pure-FTPd 1.0.48 allows remote attackers to prevent legitimate server use by making enough connections to exce…
    CVE-2020-9274 (CVSS 7.5) — An issue was discovered in Pure-FTPd 1.0.49. An uninitialized pointer vulnerability has been detected in the d…
    CVE-2020-9365 (CVSS 7.5) — An issue was discovered in Pure-FTPd 1.0.49. An out-of-bounds (OOB) read has been detected in the pure_strcmp …
    CVE-2019-20176 (CVSS 7.5) — In Pure-FTPd 1.0.49, a stack exhaustion issue was discovered in the listdir function in ls.c.…
    CVE-2017-12170 (CVSS 9.8) — Downstream version 1.0.46-1 of pure-ftpd as shipped in Fedora was vulnerable to packaging error due to which t…
    CVE-2011-3171 (CVSS 3.6) — Directory traversal vulnerability in pure-FTPd 1.0.22 and possibly other versions, when running on SUSE Linux …
    CVE-2011-0418 (CVSS 4) — The glob implementation in Pure-FTPd before 1.0.32, and in libc in NetBSD 5.1, does not properly expand expres…
    CVE-2011-1575 (CVSS 5.8) — The STARTTLS implementation in ftp_parser.c in Pure-FTPd before 1.0.30 does not properly restrict I/O bufferin…
    CVE-2011-0988 (CVSS 4.4) — pure-ftpd 1.0.22, as used in SUSE Linux Enterprise Server 10 SP3 and SP4, and Enterprise Desktop 10 SP3 and SP…

    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