CVE-2025-70747
Published: 14 January 2026
Summary
CVE-2025-70747 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-2025-70747 is a stack overflow vulnerability in the Tenda AX-1806 router running firmware version v1.0.0.1. The issue resides in the serviceName parameter handled by the sub_65A28 function, which can be triggered by a specially crafted request. This flaw, classified under CWE-121, was publicly disclosed on January 14, 2026, and carries 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), indicating high severity primarily due to its potential for availability disruption.
Remote attackers require no authentication, privileges, or user interaction to exploit this vulnerability over the network with low complexity. By sending a malicious request targeting the vulnerable parameter, adversaries can trigger a stack overflow, leading to a Denial of Service (DoS) condition that crashes the device and renders it unresponsive until rebooted.
Further technical details and a proof-of-concept are documented in the advisory at https://github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-1806/6/1.md. No official patches or vendor mitigations are specified in the available information.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2440
Vulnerability details
Tenda AX-1806 v1.0.0.1 was discovered to contain a stack overflow in the serviceName parameter of the sub_65A28 function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated stack overflow via crafted request to public service enables T1190 (Exploit Public-Facing Application) and directly produces DoS via T1499.004 (Application or System Exploitation).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforces validation of the serviceName parameter to block crafted requests that trigger the stack overflow.
Provides memory protections such as stack canaries to prevent stack overflows from causing device crashes.
Mandates timely patching of the stack overflow flaw in the sub_65A28 function to eliminate the vulnerability.