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    CVE-2021-39509

    An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.

    Published:Aug 24, 2021
    Last Modified:Nov 21, 2024
    EPS:Aug 24, 2021
    EPSS Score:0.16338
    CVSS Score:9.8

    Affected Products

    Vendor
    Dlink
    Product
    Dir-816
    Vendor
    Dlink
    Product
    Dir-816 Firmware

    Exploits

    https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.mdhttps://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.md

    Related CVEs

    CVE-2026-8346 (CVSS 2.1) — A vulnerability was detected in D-Link DIR-816 1.10CNB05_R1B011D88210. This affects the function portForward. …
    CVE-2026-8345 (CVSS 2.1) — A security vulnerability has been detected in D-Link DIR-816 1.10CNB05_R1B011D88210. Affected by this issue is…
    CVE-2026-8344 (CVSS 2.1) — A weakness has been identified in D-Link DIR-816 1.10CNB05_R1B011D88210. Affected by this vulnerability is the…
    CVE-2026-4184 (CVSS 8.9) — A vulnerability was detected in D-Link DIR-816 1.10CNB05. Affected by this vulnerability is an unknown functio…
    CVE-2026-4183 (CVSS 8.9) — A security vulnerability has been detected in D-Link DIR-816 1.10CNB05. Affected is an unknown function of the…
    CVE-2026-4182 (CVSS 8.9) — A weakness has been identified in D-Link DIR-816 1.10CNB05. This impacts an unknown function of the file /gofo…
    CVE-2026-4181 (CVSS 8.9) — A security flaw has been discovered in D-Link DIR-816 1.10CNB05. This affects an unknown function of the file …
    CVE-2026-4180 (CVSS 5.5) — A vulnerability was identified in D-Link DIR-816 1.10CNB05. The impacted element is an unknown function of the…
    CVE-2025-60679 (CVSS 8.8) — A stack buffer overflow vulnerability exists in the D-Link DIR-816A2 router firmware DIR-816A2_FWv1.10CNB05_R1…
    CVE-2025-61577 (CVSS 7.5) — D-Link DIR-816A2_FWv1.10CNB05 was discovered to contain a stack overflow via the statuscheckpppoeuser paramete…

    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