CVE-2025-7421: o3 Buffer Overflow — Exploit

Description

A vulnerability was found in Tenda O3V2 1.0.0.12(3880). It has been rated as critical. This issue affects the function fromMacFilterModify of the file /goform/operateMacFilter of the component httpd. The manipulation of the argument mac leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-119 Buffer Overflow

CWE-121 CWE-121

Affected Products

Vendor	Product	Versions
tenda	o3_firmware	All
tenda	o3	All

References

Exploits

https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_54/54.md https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_54/54.md#poc https://github.com/wudipjq/my_vuln/blob/main/Tenda3/vuln_54/54.md

Other References

https://vuldb.com/?ctiid.315881 https://vuldb.com/?id.315881 https://vuldb.com/?submit.608867 https://www.tenda.com.cn/

Frequently Asked Questions

What is CVE-2025-7421? +

A vulnerability was found in Tenda O3V2 1.0.0.12(3880). It has been rated as critical. This issue affects the function fromMacFilterModify of the file /goform/operateMacFilter of the component httpd. The manipulation of the argument mac leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-7421? +

CVE-2025-7421 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-7421? +

CVE-2025-7421 affects products from tenda, specifically: o3, o3_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-7421? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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