CVE-2025-7420
Published: 11 July 2025
Summary
CVE-2025-7420 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda O3 Firmware. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 18.1% of CVEs by exploit likelihood; 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
A stack-based buffer overflow vulnerability exists in Tenda O3V2 firmware version 1.0.0.12(3880) within the httpd component. Specifically, the formWifiBasicSet function in the file /goform/setWrlBasicInfo accepts an unsanitized extChannel argument that can be manipulated to overflow a stack buffer, as indicated by the associated CWE-119 and CWE-121 classifications.
An authenticated remote attacker can supply a crafted request to the affected endpoint and achieve arbitrary code execution or a denial of service on the device. The CVSS 4.0 vector reflects network attack reachability with low complexity and no user interaction required once valid credentials are obtained. Public proof-of-concept code demonstrating the flaw has already been released.
The EPSS score has remained flat at 0.0157 with no material increase since disclosure. Available references consist of technical write-ups and exploit artifacts hosted on GitHub and VulDB; no vendor advisory or firmware update addressing the issue is referenced in the supplied materials.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-21096
Vulnerability details
A vulnerability was found in Tenda O3V2 1.0.0.12(3880). It has been declared as critical. This vulnerability affects the function formWifiBasicSet of the file /goform/setWrlBasicInfo of the component httpd. The manipulation of the argument extChannel leads to stack-based buffer overflow. The…
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attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in Tenda O3V2 httpd web interface (/goform/setWrlBasicInfo formWifiBasicSet extChannel) allows remote exploitation for potential RCE on a public-facing router application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires identification, reporting, and correction of the stack-based buffer overflow flaw in the httpd formWifiBasicSet function.
Enforces validation of the extChannel argument at the /goform/setWrlBasicInfo endpoint to block malformed inputs causing buffer overflows.
Implements memory safeguards like stack canaries and non-executable memory to prevent successful exploitation of the stack-based buffer overflow.