CVE-2021-47854

CRITICAL

DD-WRT <45723 - Buffer Overflow

Title source: llm

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.

Exploits (1)

exploitdb WORKING POC

by Enesdex · pythondoshardware

https://www.exploit-db.com/exploits/49730

View Code ZIP pw:eip

References (5)

[Various Sources] https://dd-wrt.com/

[Various Sources] https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/

[Various Sources] https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/

[Third Party Advisory] https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow

[Exploit, Third Party Advisory] https://www.exploit-db.com/exploits/49730

Scores

CVSS v3 9.8

EPSS 0.0010

EPSS Percentile 27.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-120

Status published

Products (1)

embeDD GmbH/DD-WRT 45723

Published Jan 21, 2026

Tracked Since Feb 18, 2026