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Vulnerability record · CVE-2021-28152 · published 6 May 2021

CVE-2021-28152: Hongdian h8922 firmware improper authentication vulnerability

Hongdian · H8922 Firmware

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.

9.8 CVSS 3.1 Critical EPSS 5.2% · top 7.8% CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://en.hongdian.com/Products/Details/H8922 ProductVendor Advisory
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/ ExploitThird Party Advisory
http://en.hongdian.com/Products/Details/H8922 ProductVendor Advisory
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-28152), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.