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CVE-2021-47854

CRITICAL

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/21/2026

Last Modified1/26/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-120

References

https://dd-wrt.com/(disclosure@vulncheck.com)

https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/(disclosure@vulncheck.com)

https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/(disclosure@vulncheck.com)

https://www.exploit-db.com/exploits/49730(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow(disclosure@vulncheck.com)

IOC Correlations

No correlations recorded

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