CVE-2021-47854
DD-WRT 45723 - UPNP Buffer Overflow
- State
- Published
- Severity
- 8.7 High
- Published
- Jan 21, 2026
- Updated
- Jul 28, 2026
- Reserved
- Jan 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected Products
| Product | Versions |
|---|---|
DD-WRTembeDD GmbH |
|
References
- ExploitDB-49730exploit
- DD-WRT Official Vendor Homepageproduct
- DD-WRT Software Download Repositoryproduct
- SSD Security Advisory for DD-WRT UPNP Buffer Overflowtechnical-description
- VulnCheck Advisory: DD-WRT 45723 - UPNP Buffer Overflowthird-party-advisory
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