# CVE-2026-10191: Tenda W12 stack overflow in cgiWifiMacFilterSet

Source: https://junglewise.ai/threats/cve-2026-10191-tenda-w12-stack-overflow-in-cgiwifimacfilterset  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-31. Updated: 2026-05-31  
License: CC BY 4.0 with a link back

CVE-2026-10191 · Severity: high · CVSS 8.8 · Published 2026-05-31

A security vulnerability exists in the Tenda W12 wireless router, a device used to provide internet connectivity in homes and small offices. An attacker can exploit this flaw to gain unauthorized control over the device by sending specially crafted data to the router's management interface. This could lead to a complete disruption of internet services, interception of network traffic, or unauthorized access to the internal network.

Technologies: [Tenda W12](https://junglewise.ai/threats/technologies/w12). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-10191 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10191 being exploited in the wild.

**How severe is CVE-2026-10191?** High severity, with a CVSS score of 8.8, published 31 May 2026.

**Which products and versions are affected?** Tenda W12 3.0.0.7(4763).

**Is there a fix for CVE-2026-10191?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-10191 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-10191?** Check whether you run Tenda W12 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability (CWE-121) exists in the Tenda W12 router firmware version 3.0.0.7(4763). The flaw is located within the 'cgiWifiMacFilterSet' function of the '/bin/httpd' binary. It is triggered by improper length validation of the 'wifiMacFilterSet.macList.mac' argument. A remote attacker with low-level privileges can exploit this by sending a malicious request to the web management interface, potentially leading to remote code execution (RCE) or a crash of the HTTP service. Public exploit details have been disclosed.

## Affected products

- Tenda W12 3.0.0.7(4763)

## Timeline

- 2026-05-31: disclosed
- 2026-05-31: advisory

## References

- [http://cdn2.v50to.cc/cgiWifiMacFilterSet_overflow.zip](http://cdn2.v50to.cc/cgiWifiMacFilterSet_overflow.zip)
- [https://vuldb.com/cve/CVE-2026-10191](https://vuldb.com/cve/CVE-2026-10191)
- [https://vuldb.com/submit/820023](https://vuldb.com/submit/820023)
- [https://vuldb.com/vuln/367472](https://vuldb.com/vuln/367472)
- [https://vuldb.com/vuln/367472/cti](https://vuldb.com/vuln/367472/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

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- [Tenda W12 denial of service in Web Management Interface](https://junglewise.ai/threats/cve-2026-10190-tenda-w12-denial-of-service-in-web-management-interface)
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