ByteOS Network

NVD Vulnerability Details :

CVE-2021-47854

Awaiting Analysis

Source-disclosure@vulncheck.com

Published At-21 Jan, 2026 | 18:16

Updated At-26 Jan, 2026 | 15:04

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	8.7	HIGH	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary	3.1	9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Type: Secondary

Version: 4.0

Base score: 8.7

Base severity: HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Type: Primary

Version: 3.1

Base score: 9.8

Base severity: CRITICAL

Vector:

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

Weaknesses

CWE ID	Type	Source
CWE-120	Primary	disclosure@vulncheck.com

CWE ID: CWE-120

Type: Primary

Source: disclosure@vulncheck.com

References

Hyperlink	Source	Resource
https://dd-wrt.com/	disclosure@vulncheck.com	N/A
https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/	disclosure@vulncheck.com	N/A
https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/	disclosure@vulncheck.com	N/A
https://www.exploit-db.com/exploits/49730	disclosure@vulncheck.com	N/A
https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow	disclosure@vulncheck.com	N/A