CVE-2026-38577
CriticalPublished
Insecure hardcoded credentials in the Admin account of Tenda HG21 V4.0.0-260302 allows attackers to gain root access.
- Published
- Aug 31, 2026
- Updated
- Sep 1, 2026
- Assigning CNA
- mitre
- Evidence observed
- Sep 3, 2026
Primary CVSS
9.8/ 10Critical
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H0.3%
Low · next 30 days
- Percentile
- 26.4%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Insecure hardcoded credentials in the Admin account of Tenda HG21 V4.0.0-260302 allows attackers to gain root access.
Sources
1Proof-of-concept demonstrating hardcoded root credentials (admin/system) in Tenda HG21 XPON modem firmware, enabling unauthorized root access via telnet or FTP.
Responsible use
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