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9.8

Tenda HG21 routers let attackers log in as admin

CVE-2026-38577 · published 2 months ago
Summary

The Tenda HG21 router firmware includes a fixed admin username and password that are publicly known. Anyone who discovers these credentials can sign in and gain full control of the device. Update the router to the latest firmware or change the admin password to a strong, unique one as soon as possible.

Original advisory text
Insecure hardcoded credentials in the Admin account of Tenda HG21 V4.0.0-260302 allows attackers to gain root access.
Insecure hardcoded credentials in the Admin account of Tenda HG21 V4.0.0-260302 allows attackers to gain root access.
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-798Use of Hard-coded Credentials
Timeline
Published31 Aug 2026
Updated3 Nov 2026
First seen31 Aug 2026
Sources
CVE-2026-38577 · NVD
CVE-2026-38577 · MITRE
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