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    CVE-2026-38821

    A heap-based buffer overflow vulnerability exists in openNDS before 11.0.0 that allows an unauthenticated attacker on the captive portal network to crash the openNDS daemon (denial of service) and potentially achieve remote code execution. This is in http_microhttpd.c.

    Published:Aug 28, 2026
    Last Modified:Aug 28, 2026
    EPS:Aug 28, 2026
    EPSS Score:0.00201
    CVSS Score:7.1

    Affected Products

    Vendor
    Opennds
    Product
    Opennds

    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-2026-38822 (CVSS 7.6) — In openNDS before 11.0.0, the client_params.sh script, invoked by the openNDS daemon to serve the authenticate…
    CVE-2026-38820 (CVSS 8.3) — openNDS before 11.0.0 is susceptible to unauthenticated OS command execution via shell command injection throu…
    CVE-2026-38819 (CVSS 5.3) — Multiple memory leaks in openNDS before 11.0.0 allow an unauthenticated attacker on the captive portal network…
    CVE-2024-25763 (CVSS 5.5) — openNDS 10.2.0 is vulnerable to Use-After-Free via /openNDS/src/auth.c.…
    CVE-2023-38317 (CVSS 9.8) — An issue was discovered in OpenNDS before 10.1.3. It fails to sanitize the network interface name entry in the…
    CVE-2023-38318 (CVSS 9.8) — An issue was discovered in OpenNDS before 10.1.3. It fails to sanitize the gateway FQDN entry in the configura…
    CVE-2023-38319 (CVSS 9.8) — An issue was discovered in OpenNDS before 10.1.3. It fails to sanitize the FAS key entry in the configuration …
    CVE-2023-38323 (CVSS 9.8) — An issue was discovered in OpenNDS before 10.1.3. It fails to sanitize the status path script entry in the con…
    CVE-2023-41102 (CVSS 7.5) — An issue was discovered in the captive portal in OpenNDS before version 10.1.3. It has multiple memory leaks d…
    CVE-2023-41101 (CVSS 9.8) — An issue was discovered in the captive portal in OpenNDS before version 10.1.3. get_query in http_microhttpd.c…

    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