Auth bypass in Hongdian H8922
CVE-2021-28152
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.
Vulnerability class: Broken Authentication
EPSS: 0.052 (91.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Hongdian H8922
- Hongdian H8922_firmware — versions 3.0.5
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Product, x_refsource_MISC, Vendor Advisory)
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-28152?
- CVE-2021-28152 is a critical-severity vulnerability in Hongdian H8922, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-05-06.
- How severe is CVE-2021-28152?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-28152 known to be exploited?
- 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.