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9.8

Tenda AC7 WAN MTU Parameter Overflow

CVE-2026-51843 · published 4 months ago
Summary

The Tenda AC7 router's WAN MTU setting can be exploited by an attacker to cause the router to crash or potentially execute malicious code. This affects routers running firmware version 15.03.06.44. To protect your network, update the router's firmware to the latest version.

Original advisory text
Tenda AC7 v15.03.06.44 contains a stack buffer overflow vulnerability in the /goform/AdvSetMacMtuWan interface via the wanMTU parameter.
Tenda AC7 v15.03.06.44 contains a stack buffer overflow vulnerability in the /goform/AdvSetMacMtuWan interface via the wanMTU parameter.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published19 Jun 2026
Updated4 Nov 2026
First seen19 Jun 2026
Sources
CVE-2026-51843 · NVD
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