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    CVE-2021-47854

    DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.

    Published:Jan 21, 2026
    Last Modified:Jul 28, 2026
    EPS:Jan 21, 2026
    EPSS Score:0.00975
    CVSS Score:9.8

    Affected Products

    Vendor
    Dd-wrt
    Product
    Dd-wrt

    Exploits

    No exploit reference

    Related CVEs

    CVE-2021-27137 (CVSS 8.1) — An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handlin…
    CVE-2022-27631 (CVSS 9.8) — A memory corruption vulnerability exists in the httpd unescape functionality of DD-WRT Revision 32270 - Revisi…
    CVE-2020-13976 (CVSS 8.8) — An issue was discovered in DD-WRT through 16214. The Diagnostic page allows remote attackers to execute arbitr…
    CVE-2012-6297 (CVSS 8.8) — Command Injection vulnerability exists via a CSRF in DD-WRT 24-sp2 from specially crafted configuration values…
    CVE-2009-2765 (CVSS 8.3) — httpd.c in httpd in the management GUI in DD-WRT 24 sp1, and other versions before build 12533, allows remote …
    CVE-2008-6975 (CVSS 6.8) — Multiple cross-site request forgery (CSRF) vulnerabilities in apply.cgi in DD-WRT 24 sp2 allow remote attacker…
    CVE-2009-2766 (CVSS 7.5) — httpd.c in httpd in the management GUI in DD-WRT 24 sp1 does not require administrative authentication for pro…
    CVE-2008-6974 (CVSS 6.8) — Multiple cross-site request forgery (CSRF) vulnerabilities in apply.cgi in DD-WRT 24 sp1 and earlier allow rem…

    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