CVE-2021-47854 HIGH

CVE-2021-47854: DD-WRT 45723 - UPNP Buffer Overflow

Vendor Embedd Gmbh
Product DD-WRT
Weakness CWE-120
Published January 21, 2026
Last update January 22, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 21, 2026 CVE published
January 22, 2026 Record updated