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7.4

Tenda AC12 Router Remote Reboot Attack

CVE-2026-19821 · published 2 months ago
Summary

A security issue in the Tenda AC12 router's web management interface allows an attacker to remotely restart the device. This could be used to disrupt service or gain unauthorized access. Update the router's firmware to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
tenda ac12 15.03.06.23_multi_TD01
Original advisory text
Tenda AC12 httpd web management interface SetSysAutoRebbotCfg formSetRebootTimer buffer overflow
A vulnerability was determined in Tenda AC12 15.03.06.23_multi_TD01. This vulnerability affects the function formSetRebootTimer of the file /goform/SetSysAutoRebbotCfg of the component httpd web management interface. This manipulation of the argument rebootTime causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
7.4 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-119Buffer Overflow
CWE-120Classic Buffer Overflow
Timeline
Published14 Aug 2026
Updated3 Nov 2026
First seen14 Aug 2026
Sources
CVE-2026-19821 · NVD
CVE-2026-19821 · MITRE
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