Is CVE-2026-51845 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-51845 being exploited in the wild.

How severe is CVE-2026-51845?

Informational severity, published 19 June 2026.

Is there a fix for CVE-2026-51845?

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-2026-51845 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-51845?

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.

CVE-2026-51845: Tenda AC7 stack buffer overflow in AdvSetMacMtuWan

CVE-2026-51845 · Severity: info · Published 2026-06-19

The Tenda AC7 router, a device used to provide home and small office internet connectivity, contains a security flaw in its web management interface. An attacker can exploit this vulnerability by sending a specially crafted request to the router's configuration settings. If successful, this could allow the attacker to crash the device, causing an internet outage, or potentially take full control of the router to monitor network traffic.

Technologies: Tenda Ac7. Vendors: Tenda.

Quick answers

Is CVE-2026-51845 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-51845 being exploited in the wild.
How severe is CVE-2026-51845?: Informational severity, published 19 June 2026.
Which products and versions are affected?: Tenda Ac7 V15.03.06.44.
Is there a fix for CVE-2026-51845?: 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-2026-51845 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-51845?: 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 the Tenda AC7 router firmware version V15.03.06.44. The vulnerability is located within the 'check_param_changed' method, which processes the 'mac' parameter from the '/goform/AdvSetMacMtuWan' HTTP POST interface. The application uses the unsafe 'strcpy' function to copy user-supplied input into a fixed-size stack buffer without performing length validation. A remote attacker can exploit this by sending an oversized string in the 'mac' parameter, leading to memory corruption. This can result in a denial-of-service (DoS) condition or arbitrary code execution (RCE) with the privileges of the web server.

Affected products

Tenda AC7 Router V15.03.06.44

Timeline

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

References

https://www.kdev.site/cve-request_007/

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.