CVE-2025-70252
Received Received - Intake
Stack Overflow in Tenda AC6V2 WifiWpsStart Allows Code Execution

Publication date: 2026-03-02

Last updated on: 2026-03-06

Assigner: MITRE

Description
An issue was discovered in /goform/WifiWpsStart in Tenda AC6V2.0 V15.03.06.23_multi. The index and mode are controllable. If the conditions are met to sprintf, they will be spliced into tmp. It is worth noting that there is no size check,which leads to a stack overflow vulnerability.
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Meta Information
Published
2026-03-02
Last Modified
2026-03-06
Generated
2026-06-16
AI Q&A
2026-03-02
EPSS Evaluated
2026-06-15
NVD
CVE-2025-70252
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda ac6_firmware 15.03.06.23_multi
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2025-70252 is a stack overflow vulnerability found in the Tenda AC6V2.0 router firmware version V15.03.06.23_multi, specifically in the /goform/WifiWpsStart endpoint.'}, {'type': 'paragraph', 'content': "The vulnerability occurs because the parameters 'index' and 'mode' are controllable by the user and are concatenated into a temporary buffer using sprintf without any size checks, which leads to a stack overflow."}, {'type': 'paragraph', 'content': "An attacker can send a specially crafted HTTP POST request with an excessively large 'index' parameter to trigger this overflow."}] [2]

Impact Analysis

Exploiting this vulnerability can cause the router to crash, resulting in a denial of service.

More critically, it can be leveraged to execute arbitrary code on the device, potentially allowing an attacker to gain root shell access.

This means an attacker could take full control of the affected router remotely.

Compliance Impact

I don't know

Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability can be detected by sending a specially crafted HTTP POST request to the /goform/WifiWpsStart endpoint on port 80 of the Tenda AC6V2.0 router. The request should include an excessively large index parameter (for example, 0x3000 bytes of the character 'a') combined with mode=1."}, {'type': 'paragraph', 'content': 'If the router crashes or becomes unresponsive after this request, it indicates the presence of the stack overflow vulnerability.'}, {'type': 'paragraph', 'content': 'The HTTP request headers should mimic legitimate browser requests, including cookies and user-agent strings, to avoid detection.'}, {'type': 'paragraph', 'content': "Example command using curl to test the vulnerability (replace <router_ip> with the target device's IP):"}, {'type': 'list_item', 'content': 'curl -X POST http://<router_ip>/goform/WifiWpsStart -d "index=$(python3 -c \'print("a"*12288)\')&mode=1" -H "User-Agent: Mozilla/5.0" -H "Cookie: session=abcd"'}] [2]

Mitigation Strategies

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