CVE-2021-47854

EUVD-2026-3629
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.
Classic Buffer Overflow
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheckCNA
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 24%
Common Weakness Enumeration
References
https://dd-wrt.com/
https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/
https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/
https://www.exploit-db.com/exploits/49730
https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow