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CVE-2021-27137 is a stack-based buffer overflow in DD-WRT builds before 45724. The UPnP SSDP M-SEARCH handling path, specifically ssdp_msearch, uses an unsafe strcpy operation to copy attacker-controlled request data into an internal fixed-size buffer. An unauthenticated remote attacker can send a specially crafted SSDP M-SEARCH request to overflow the buffer when UPnP is enabled.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
48 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A DD-WRT vulnerability listed among vulnerabilities actively exploited or operationally weaponized in July 2026.
A stack-based buffer overflow vulnerability in DD-WRT firmware affecting routers and network appliances.
A stack-based buffer overflow vulnerability in DD-WRT mentioned as one of the flaws added to CISA's KEV catalog.
A stack-based buffer overflow vulnerability in DD-WRT UPnP handling that can allow unauthenticated remote code execution via a crafted M-SEARCH request when UPnP is enabled.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.