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    CVE-2026-63090

    ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem struct, and redirect pr_fsio_stat() to system() via a crafted RENAME request.

    Published:Jul 20, 2026
    Last Modified:Jul 28, 2026
    EPS:Jul 20, 2026
    EPSS Score:0.00464
    CVSS Score:8.8

    Affected Products

    Vendor
    Proftpd
    Product
    Proftpd

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-63091 (CVSS 7.1) — ProFTPD before 1.3.9c and 1.3.10rc3 contains a signed integer overflow vulnerability in the mod_sftp module's …
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    CVE-2026-35025 (CVSS 8.6) — ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated…
    CVE-2026-44331 (CVSS 8.1) — In ProFTPD through 1.3.9a before 7666224, a SQL injection vulnerability in sqltab_fetch_clients_cb() in contri…
    CVE-2026-42167 (CVSS 8.1) — mod_sql in ProFTPD before 1.3.9a allows remote attackers to execute arbitrary code via a username, in scenario…
    CVE-2021-47865 (CVSS 8.7) — ProFTPD 1.3.7a contains a denial of service vulnerability that allows attackers to overwhelm the server by cre…
    CVE-2010-20103 (CVSS 9.3) — A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 2…
    CVE-2024-48651 (CVSS 7.5) — In ProFTPD through 1.3.8b before cec01cc, supplemental group inheritance grants unintended access to GID 0 bec…
    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…
    CVE-2023-48795 (CVSS 5.9) — The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, al…

    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