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 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 18.4% 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).
Threat & Defense at a Glance
Threat & Defense Details
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.
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.
NVD Description
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.
Deeper analysisAI
CVE-2025-7420 is a critical stack-based buffer overflow vulnerability affecting the Tenda O3V2 router on firmware version 1.0.0.12(3880). The flaw exists in the formWifiBasicSet function of the /goform/setWrlBasicInfo endpoint within the httpd component, where manipulation of the extChannel argument triggers the overflow.
The vulnerability can be exploited remotely by an attacker with low privileges (PR:L), requiring low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation grants high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H), yielding a CVSS v3.1 base score of 8.8. It maps to CWEs 119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and 121 (Stack-based Buffer Overflow).
References point to GitHub repositories with vulnerability details and a proof-of-concept exploit, alongside VulDB entries documenting the issue. The exploit has been publicly disclosed and may be used.
Details
- CWE(s)