Vulnerability · Published Dec 31, 2025 · Assigned by VulnCheck
CVE-2021-47741ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint
High 7.5
In plain English
A high-severity security flaw in ZBL EPON ONU Broadband Router from Zblchina. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Official description
ZBL EPON ONU Broadband Router V100R001 contains a privilege escalation vulnerability that allows limited administrative users to elevate access by sending requests to configuration endpoints. Attackers can exploit the vulnerability by accessing the configuration backup or password page to disclose the super user password and gain additional privileged functionalities.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zblchina | ZBL EPON ONU Broadband Router | 1.0 |
Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- ExploitDB-49737 exploit
- ZBL China Vendor Homepage product
- Archived W&D Thailand Vendor Homepage product
- Zero Science Lab Disclosure (ZSL-2021-5647) third-party-advisory
- VulnCheck Advisory: ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint third-party-advisory