Cyber Resilience

CVE-2025-71019

HighPublic PoC

Published: 15 January 2026

Published
15 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 0.0013 31.3th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-71019 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Tenda Ax1806 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 31.3th 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).

Deeper analysis

CVE-2025-71019 is a stack-based buffer overflow vulnerability affecting the Tenda AX-1806 router on firmware version v1.0.0.1. The flaw occurs in the wanSpeed parameter processed by the sub_65B5C function, as disclosed on January 15, 2026. It 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 maps to CWE-121.

Unauthenticated remote attackers with network access to the device can exploit this vulnerability by sending a specially crafted request to the affected parameter. Exploitation triggers a stack overflow, enabling a Denial of Service (DoS) condition that disrupts device availability without impacting confidentiality or integrity.

Further details, including potential mitigation guidance, are available in the referenced advisory at https://github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-1806/9/1.md.

EU & UK References

Vulnerability details

Tenda AX-1806 v1.0.0.1 was discovered to contain a stack overflow in the wanSpeed parameter of the sub_65B5C 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?

Unauthenticated remote stack overflow in public router web interface directly enables T1190 exploitation and T1499.004 DoS via crafted request.

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

CVEs Like This One

CVE-2025-70744Same product: Tenda Ax1806
CVE-2025-70644Same product: Tenda Ax1806
CVE-2025-70656Same product: Tenda Ax1806
CVE-2025-71021Same product: Tenda Ax1806
CVE-2025-70746Same product: Tenda Ax1806
CVE-2025-70645Same product: Tenda Ax1806
CVE-2025-70747Same product: Tenda Ax1806
CVE-2025-70650Same product: Tenda Ax1806
CVE-2025-70753Same product: Tenda Ax1806
CVE-2025-71020Same product: Tenda Ax1806

Affected Assets

tenda
ax1806 firmware
1.0.0.1

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly enforces validation of inputs like the wanSpeed parameter to prevent stack overflows from crafted requests.

SI-16 Memory Protection good match
prevent

Implements memory protections such as stack canaries and address space randomization to mitigate stack-based buffer overflows.

SI-2 Flaw Remediation good match
prevent

Mandates timely identification and remediation of software flaws like this stack overflow via firmware patching.

References