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CVE-2021-27137 is a stack-based buffer overflow vulnerability in DD-WRT firmware before build 45724. The flaw is located in router/upnp/src/ssdp.c in the ssdp_msearch code path, where unsafe use of strcpy in UPnP SSDP request handling can copy attacker-controlled data into an internal fixed-size buffer without proper bounds checking. The vulnerable path is reachable via a crafted SSDP M-SEARCH request, including oversized ST:uuid values, allowing a remote unauthenticated attacker to trigger memory corruption when UPnP is enabled. Depending on exploit reliability and target conditions, successful exploitation can result in process crash, denial of service, or arbitrary code execution on the affected router.
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No public exploit code observed for this vulnerability.
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28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stack buffer overflow vulnerability in DD-WRT UPnP handling that can be triggered unauthenticated via a crafted M-SEARCH request.
A buffer overflow vulnerability in DD-WRT's UPnP handling (ssdp_msearch in router/upnp/src/ssdp.c) that can allow an unauthenticated remote attacker to overflow an internal fixed buffer when UPnP is enabled.
A stack buffer overflow vulnerability in router firmware's SSDP parser that can be triggered via specially crafted M-SEARCH requests over UDP/1900, and is used by the COXMO/Gafgyt botnet variant for initial access.
A stack buffer overflow in the UPnP service of DD-WRT router firmware, exploitable via crafted UDP/SSDP M-SEARCH requests without authentication, used by the C0XMO botnet for initial access and scanning.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.