CVE-2021-47854

DD-WRT 45723 - UPNP Buffer Overflow

Published Jan 21, 2026 CVSS 4.0 · 8.7 High EPSS 1.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:o:dd-wrt:dd-wrt:45723:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Dd-wrt
Dd-wrt dd-wrt
Vendors & Products Dd-wrt
Dd-wrt dd-wrt
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title DD-WRT 45723 - UPNP Buffer Overflow
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Jul 28, 2026, 1:47 AM
Reserved
Jan 14, 2026, 5:11 PM
Status
Deferred
Published
Jan 21, 2026, 6:16 PM
Modified
Jun 17, 2026, 4:18 AM