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    CVE-2021-47865

    ProFTPD 1.3.7a contains a denial of service vulnerability that allows attackers to overwhelm the server by creating multiple simultaneous FTP connections. Attackers can repeatedly establish connections using threading to exhaust server connection limits and block legitimate user access.

    Published:Jan 21, 2026
    Last Modified:Apr 15, 2026
    EPS:Jan 21, 2026
    EPSS Score:0.0002
    CVSS Score:7.5

    Affected Products

    Vendor
    Proftpd
    Product
    Proftpd

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2010-20103 (CVSS 9.3) — A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 2…
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    CVE-2023-51713 (CVSS 7.5) — make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because o…
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    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