Forensia CTI Core

Verdict

KNOWN VULNERABILITY

What is this: 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 unauthenticate… (CWE-121) Affects cpe:2.3:o:dd-wrt:dd-wrt:*:*:*:*:*:*:*:*.
Should you care: A known software vulnerability. Exploitation likelihood: EPSS 5% (92nd percentile).
What to do: Patch when able.

What this is

Full 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).

Threat detail

Exploitation status and malware-family attribution from stored fields.

exploitation: unknown

Vulnerability intel

Local EPSS row, KEV flag, and catalog notes from stored metadata only.

Not in KEVEPSS pct 0.9

CVE: CVE-2021-27137
EPSS score: 0.05447
EPSS fetched_at: 2026-07-22T10:15:24.651569Z

Affected products

Vendor/product strings parsed from local CPE URIs (no inferred ATT&CK).

Product	CPE (truncated)
cpe:2.3:o:dd-wrt:dd-wrt::::::::	cpe:2.3:o:dd-wrt:dd-wrt::::::::

connectors · 2 entities · 1 products · 1

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