CVE-2021-28152
CRITICALCVSS 9.8/10EPSS 5.18%
Last modified
CVE-2021-28152 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 5.18% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Hongdian | H8922 Firmware | 3.0.5 |
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
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-28152?
CVE-2021-28152 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.18% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28152?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-28152?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST