CVE-2021-47854
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductDD-WRT
PublishedJan 21, 2026
First seenJan 21, 2026
Weakness typeCWE-120CWE-120
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| embeDD GmbH DD-WRT | 45723 | — |
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