Cyber Resilience

CVE-2025-71023

HighPublic PoC

Published: 13 January 2026

Published
13 January 2026
Modified
20 January 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0009 25.1th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-71023 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Tenda Ax3 Firmware. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 25.1th 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 SC-5 (Denial-of-service Protection) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2025-71023 is a stack overflow vulnerability in the Tenda AX-3 router running firmware version v16.03.12.10_CN. The flaw occurs in the mac2 parameter of the fromAdvSetMacMtuWan function, which can be triggered by a crafted request.

Remote attackers can exploit this vulnerability with no required privileges, authentication, or user interaction over the network. Successful exploitation leads to a Denial of Service (DoS) condition, with no impact on confidentiality or integrity. The vulnerability has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is associated with CWE-121 (Stack-based Buffer Overflow).

Additional details are available in the referenced advisory at https://github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-3/11/1.md.

EU & UK References

Vulnerability details

Tenda AX-3 v16.03.12.10_CN was discovered to contain a stack overflow in the mac2 parameter of the fromAdvSetMacMtuWan function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Stack overflow in public router web interface (fromAdvSetMacMtuWan) allows unauthenticated remote crafted requests causing DoS via application exploitation.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2025-69766Same product: Tenda Ax3
CVE-2025-69764Same product: Tenda Ax3
CVE-2025-71026Same product: Tenda Ax3
CVE-2025-71027Same product: Tenda Ax3
CVE-2025-71024Same product: Tenda Ax3
CVE-2025-69763Same product: Tenda Ax3
CVE-2025-69762Same product: Tenda Ax3
CVE-2025-69765Same product: Tenda Ax3
CVE-2025-71025Same product: Tenda Ax3
CVE-2025-55603Same product: Tenda Ax3

Affected Assets

tenda
ax3 firmware
16.03.12.10_cn

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly remediates the stack overflow flaw in the fromAdvSetMacMtuWan function through timely firmware patching to eliminate the vulnerability.

SI-10 Information Input Validation good match
prevent

Validates the mac2 parameter in crafted requests to prevent stack overflows that lead to DoS.

SC-5 Denial-of-service Protection good match
prevent

Protects against DoS impacts from remote stack overflow exploitation by limiting effects on system availability.

References