CVE-2021-47854

CRITICAL 9.8

DD-WRT 45723 - UPNP Buffer Overflow

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-120
Vendor	embedd gmbh
Product	dd-wrt
Published	Jan 21, 2026
Last Updated	Jul 28, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

embeDD GmbH / DD-WRT

45723

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Selim Enes 'Enesdex' Karaduman