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