CVE-2021-47854

CRITICAL

DD-WRT 45723 - Remote Code Execution via UPNP M-SEARCH UUID Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47854. PoCs published by Enesdex.

AI-analyzed exploit summary This exploit demonstrates a buffer overflow vulnerability in DD-WRT's UPnP service via a malformed M-SEARCH packet. The PoC sends a UDP packet with an oversized payload to trigger the overflow, potentially allowing remote code execution.

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.

Exploits (1)

exploitdb WORKING POC
by Enesdex · pythondoshardware
https://www.exploit-db.com/exploits/49730

This exploit demonstrates a buffer overflow vulnerability in DD-WRT's UPnP service via a malformed M-SEARCH packet. The PoC sends a UDP packet with an oversized payload to trigger the overflow, potentially allowing remote code execution.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Trivial
Reliability
Theoretical
Target: DD-WRT 45723 or prior
No auth needed
Prerequisites: Network access to the target's UPnP service (UDP port 1900)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/49730
Various Sources product
https://dd-wrt.com/
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow

Scores

CVSS v3 9.8
EPSS 0.0097
EPSS Percentile 57.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-120
Status published
Products (1)
embeDD GmbH/DD-WRT 45723
Published Jan 21, 2026
Tracked Since Feb 18, 2026