Security Advisory

CVE-2021-27137

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-16 00:00:00

Last updated 2026-07-22 03:55:45

Assigner mitre

CVSS score 8.1

State PUBLISHED

Description

An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows an unauthenticated remote attacker to send a request that would overflow an internal fixed buffer. Exploitation requires the DD-WRT user to enable UPnP (which is off by default, and only listens on internal interfaces by default). This occurs in ssdp_msearch (reachable by an M-SEARCH request).

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