CVE-2026-24108
Published: 02 March 2026
Summary
CVE-2026-24108 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Tenda W20E Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the buffer overflow by applying vendor firmware patches that fix the unsafe sprintf concatenation without size validation.
Requires validation of the attacker-controlled nptr parameter to ensure it does not exceed buffer limits before passing to getMibPrefix and sprintf.
Implements memory protections like stack canaries, ASLR, and DEP to prevent successful exploitation of the buffer overflow for code execution or DoS.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in exposed router firmware (public-facing management interface) directly enables remote unauthenticated RCE, mapping to exploitation of public-facing applications.
NVD Description
An issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by controlling the value of `nptr`. When this value is passed into the `getMibPrefix` function and concatenated using `sprintf` without proper size validation, it could lead to…
more
a buffer overflow vulnerability.
Deeper analysisAI
CVE-2026-24108 is a buffer overflow vulnerability (CWE-120) discovered in the Tenda W20E router firmware version V4.0br_V15.11.0.6. The issue arises when attackers control the value of the `nptr` parameter, which is passed to the `getMibPrefix` function and concatenated using `sprintf` without proper size validation, potentially leading to a buffer overflow. The vulnerability has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity with high impacts on confidentiality, integrity, and availability.
Remote attackers require no privileges or user interaction to exploit this vulnerability over the network with low complexity. By supplying a malicious `nptr` value, they can trigger the buffer overflow in the affected firmware, potentially achieving arbitrary code execution, data corruption, or denial of service on the targeted Tenda W20E device.
Mitigation details are available in the vendor advisory at https://www.tenda.com.cn/material/show/2707. Additional technical analysis can be found at https://github.com/akuma-QAQ/CVEreport/tree/main/D-link/CVE-2026-24108. Security practitioners should apply any available firmware patches and restrict network access to the device where possible.
Details
- CWE(s)