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    CVE-2021-21311

    Adminer is an open-source database management in a single PHP file. In adminer from version 4.0.0 and before 4.7.9 there is a server-side request forgery vulnerability. Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. This is fixed in version 4.7.9.

    Published:Feb 11, 2021
    Last Modified:Oct 24, 2025
    EPS:Feb 11, 2021
    EPSS Score:0.93901
    CVSS Score:7.2

    CISA Notification

    Description

    Adminer is an open-source database management in a single PHP file. In adminer from version 4.0.0 and before 4.7.9 there is a server-side request forgery vulnerability. Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. This is fixed in version 4.7.9.

    Required Action:

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Notes:

    No extra notes provided.

    Due Date
    Oct 20, 2025
    326 days ago
    Alert Date
    Sep 29, 2025
    347 days ago

    Affected Products

    Vendor
    Adminer
    Product
    Adminer
    Vendor
    Debian
    Product
    Debian Linux

    Exploits

    https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdfhttps://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdfhttps://github.com/llhala/CVE-2021-21311https://github.com/omoknooni/CVE-2021-21311https://github.com/Sudo-WP/sudowp-adminer

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2026-56706 (CVSS 6.1) — Adminer before 5.4.3 uses a CSRF token scheme that transmits both the XOR mask and the masked value in every t…
    CVE-2026-56705 (CVSS 9.3) — Adminer before 5.4.3 fails to sanitize the server field before constructing a PDO DSN string, allowing unauthe…
    CVE-2026-56704 (CVSS 5.3) — Adminer before 5.4.3 inserts unsanitized database server version strings into script tags with valid CSP nonce…
    CVE-2026-56703 (CVSS 8.6) — Adminer before 5.4.3 contains a remote code execution vulnerability in SQLite query handling where VACUUM INTO…
    CVE-2026-56702 (CVSS 7.1) — Adminer versions before 5.4.3 contain an unrestricted file upload vulnerability in the AdminerFileUpload plugi…
    CVE-2026-34968 (CVSS 7.2) — Adminer before 5.4.3 contains an arbitrary file deletion vulnerability in SQLite mode where the database-list …
    CVE-2026-34967 (CVSS 5.3) — Adminer versions 5.3.0 through 5.4.2 with the sql-log plugin enabled contain an arbitrary file write vulnerabi…
    CVE-2026-34964 (CVSS 6.9) — Adminer before 5.5.0 contains a server-side request forgery vulnerability in the login form's server field val…
    CVE-2026-34959 (CVSS 5.3) — Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER["REQUEST_URI"] w…
    CVE-2026-16434 (CVSS 2.3) — Adminer 4.6.0 through 5.5.0 (fixed in 5.5.1) contains an incomplete fix for a prior X-Forwarded-Prefix vulnera…

    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