# CVE-2026-51846: Tenda AC7 stack overflow in /goform/AdvSetMacMtuWan

Source: https://junglewise.ai/threats/cve-2026-51846-tenda-ac7-stack-overflow-in-goform-advsetmacmtuwan  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-19. Updated: 2026-06-21  
License: CC BY 4.0 with a link back

CVE-2026-51846 · Severity: info · CVSS 9.8 · Published 2026-06-19

The Tenda AC7 is a wireless router used for home and small office networking. A security flaw in its web management interface allows an attacker to send a specially crafted request that can crash the device or take full control of it. This could lead to a complete loss of internet connectivity or allow an unauthorized person to monitor network traffic and access sensitive data.

Technologies: [Tenda Ac7](https://junglewise.ai/threats/technologies/ac7). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-51846 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-51846 being exploited in the wild.

**How severe is CVE-2026-51846?** Informational severity, with a CVSS score of 9.8, published 19 June 2026.

**Which products and versions are affected?** Tenda Ac7 v15.03.06.44.

**Is there a fix for CVE-2026-51846?** 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-2026-51846 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-51846?** Check whether you run Tenda Ac7 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 exists in Tenda AC7 firmware version v15.03.06.44. The vulnerability is located in the check_param_changed method, which processes the wanSpeed parameter from the /goform/AdvSetMacMtuWan route. The application uses the unsafe strcpy function to copy user-controlled input into a fixed-size stack buffer without proper bounds checking. A remote attacker can exploit this by sending a crafted POST request to the router's web interface, leading to a denial-of-service (DoS) condition or arbitrary code execution (RCE) with elevated privileges.

## Affected products

- Tenda AC7 v15.03.06.44

## Timeline

- 2026-04-30: disclosed: Initial vulnerability report by KDEV
- 2026-06-19: advisory: CVE published to NVD dataset

## References

- [https://www.kdev.site/cve-request_005/](https://www.kdev.site/cve-request_005/)

## Related threats

- [Tenda AC7 stack buffer overflow in AdvSetMacMtuWan](https://junglewise.ai/threats/cve-2026-51845-tenda-ac7-stack-buffer-overflow-in-advsetmacmtuwan)
- [Tenda AC7 stack buffer overflow in AdvSetMacMtuWan](https://junglewise.ai/threats/cve-2026-51844-tenda-ac7-stack-buffer-overflow-in-advsetmacmtuwan)
- [Tenda AC7 stack buffer overflow in AdvSetMacMtuWan](https://junglewise.ai/threats/cve-2026-51843-tenda-ac7-stack-buffer-overflow-in-advsetmacmtuwan)
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