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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.

PUBLISHED Reserved 2026-01-14 | Published 2026-01-21 | Updated 2026-01-22 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Product status

45723
affected

Credits

Selim Enes 'Enesdex' Karaduman finder

References

www.exploit-db.com/exploits/49730 (ExploitDB-49730) exploit

dd-wrt.com/ (DD-WRT Official Vendor Homepage) product

download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/ (DD-WRT Software Download Repository) product

ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/ (SSD Security Advisory for DD-WRT UPNP Buffer Overflow) technical-description

www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow (VulnCheck Advisory: DD-WRT 45723 - UPNP Buffer Overflow) third-party-advisory

cve.org (CVE-2021-47854)

nvd.nist.gov (CVE-2021-47854)

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