CVE-2021-47854

high

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.

References

https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow

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

https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/

https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/

https://dd-wrt.com/

Details

Source: Mitre, NVD

Published: 2026-01-21

Updated: 2026-04-15

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

CVSS v4

Base Score: 8.7

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

Severity: High

EPSS

EPSS: 0.00193