CVE-2021-28152
Hongdian H8922 3.0.5 devices have an undocumented feature that allows access to a shell as a superuser.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.18% probability · 92th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- hongdian/h8922 firmware
- Source
- cve@mitre.org
EPSS 5.2% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://en.hongdian.com/Products/Details/H8922Product, Vendor Advisory
- https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/Exploit, Third Party Advisory
- http://en.hongdian.com/Products/Details/H8922Product, Vendor Advisory
- https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.