CVE-2021-47854

8.7 highEPSS 1.1%

High (8.7). EPSS 1.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 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

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
CWE: CWE-120
Published: 2026-01-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

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

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