CVE-2026-51846 Tenda CVE debrief

Who should care

Organizations using Tenda AC7 routers, specifically version 15.03.06.44, should be aware of this vulnerability and take steps to mitigate or patch it. This includes network administrators, cybersecurity teams, and IT professionals responsible for maintaining network infrastructure. The potential for remote arbitrary code execution makes this a high-priority vulnerability to address.

Technical summary

The CVE-2026-51846 vulnerability is a stack buffer overflow issue in the Tenda AC7 router. It is located in the wanSpeed parameter of the /goform/AdvSetMacMtuWan route. This type of vulnerability occurs when more data is written to a buffer than it is designed to hold, causing adjacent memory to be overwritten. In this case, the vulnerability could potentially allow for remote arbitrary code execution, giving an attacker control over the affected system. The vulnerability is present in Tenda AC7 version 15.03.06.44.

Defensive priority

High priority due to potential for remote arbitrary code execution

Recommended defensive actions

• Inventory Tenda AC7 routers and verify version 15.03.06.44 is in use
• Review official vendor advisories for patches or mitigations
• Apply patches or updates if available
• Implement compensating controls such as network segmentation or access restrictions
• Monitor network activity for suspicious behavior related to the Tenda AC7

Evidence notes

The primary evidence for this CVE comes from official sources, including the CVE.org record and the National Vulnerability Database (NVD). The vulnerability is described as a stack buffer overflow in the wanSpeed parameter of the /goform/AdvSetMacMtuWan route in Tenda AC7 version 15.03.06.44. The evidence suggests that this vulnerability could lead to remote arbitrary code execution. Defenders should verify the affected product and version with official sources.

Official resources