CVE-2021-28152

9.8 criticalEPSS 5.2%

Critical (9.8) in hongdian h8922 firmware. EPSS 5.2% chance of exploitation in the next 30 days.

Hongdian H8922 3.0.5 devices have an undocumented feature that allows access to a shell as a superuser. To connect, the telnet service is used on port 5188 with the default credentials of root:superzxmn.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 5.2% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2021-05-06
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

hongdian:h8922_firmware

References

http://en.hongdian.com/Products/Details/H8922
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/
http://en.hongdian.com/Products/Details/H8922
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/

Check your stack JSON