A new critical security vulnerability — CVE-2026-24113 — has been found in the popular network device Tenda W20E V4.0br_V15.11.0.6. Cybersecurity researchers reported that this vulnerability could be exploited for a serious attack on corporate and private IT infrastructure.
It is important for system administrators and developers to know that the exploitation of this vulnerability occurs remotely, without authentication or user involvement, which increases the risk for systems on the network. Rapid implementation of the security update is a critical requirement for stable operation and data protection.
What happened
A bug was discovered in the handling of the variable nptr: when its value is passed to the getMibPrefix function and processed through sprintf without size validation, it leads to a buffer overflow. Such a vulnerability allows an attacker to execute arbitrary code on the device, jeopardizing the entire IT infrastructure.
When and how an attack is possible
The vulnerability can be exploited if the attacker has control over the value of nptr. The vulnerability can be used over the network, without authentication and user interaction. This creates maximum risk — an attacker can remotely attack the device at any time. This is particularly critical for companies with remote access to routers or open administrative ports.
Why this is important
Successful exploitation of this vulnerability leads to complete compromise of network devices: immediate interference with configuration, violation of data confidentiality and integrity, disruption of business operations. The critical severity level of CVSS (9.8) indicates maximum risk for business and IT infrastructure. If the vulnerability is not closed — the organization's cybersecurity will be at risk.
Recommendations
System administrators are advised to immediately check for the Tenda W20E model with firmware V4.0br_V15.11.0.6, update devices to the latest version with the security patch, and restrict remote access to administrative interfaces. DevOps teams should regularly check for and apply security updates for network equipment.
Technical details
The vulnerability concerns Tenda W20E V4.0br_V15.11.0.6. Attack vector: network (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). CVSS score — 9.8 (critical). Additional details at Official source.
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