CVE-2021-47854

DD-WRT 45723 - UPNP Buffer Overflow

CVSS 8.7 HIGHEPSS 1.0%CWE-120

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 1.0%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

21 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

embeDD GmbH · DD-WRT

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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