CVE-2021-47854

CRITICAL
2026-01-21 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 26, 2026 - 15:04 vuln.today
Public exploit code
CVE Published
Jan 21, 2026 - 18:16 nvd
CRITICAL 9.8

Tags

Buffer Overflow

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.

Analysis

DD-WRT firmware version 45723 has a buffer overflow in the UPnP network discovery service allowing remote attackers to execute code on the router without authentication.

Technical Context

DD-WRT v45723 has a CWE-120 classic buffer overflow in its UPnP service handler. Since UPnP typically listens on the LAN interface without authentication, any device on the network can trigger the overflow.

Affected Products

['DD-WRT firmware v45723']

Remediation

Update DD-WRT firmware. Disable UPnP if not required.

Priority Score

69
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: +20

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CVE-2021-47854 vulnerability details – vuln.today
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