Buffer overflow in Embedd Gmbh Dd-Wrt
CVE-2021-47854
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.001
Affected products
- Embedd Gmbh Dd-Wrt — versions 45723
Weakness classification (CWE)
References
- ExploitDB-49730 (exploit)
- DD-WRT Official Vendor Homepage (product)
- DD-WRT Software Download Repository (product)
- SSD Security Advisory for DD-WRT UPNP Buffer Overflow (technical-description)
- VulnCheck Advisory: DD-WRT 45723 - UPNP Buffer Overflow (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47854?
- CVE-2021-47854 is a critical-severity vulnerability in Embedd Gmbh Dd-Wrt, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-01-21.
- How severe is CVE-2021-47854?
- Critical severity. CVSS v3 base score is 9.8 out of 10.