CVE-2021-47741
ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint
- State
- Published
- Severity
- 8.7 High
- Published
- Dec 31, 2025
- Updated
- Jan 2, 2026
- Reserved
- Dec 23, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-522 Insufficiently Protected Credentials
Affected Products
| Product | Versions |
|---|---|
ZBL EPON ONU Broadband RouterZblchina |
|
References
- ExploitDB-49737exploit
- ZBL China Vendor Homepageproduct
- Archived W&D Thailand Vendor Homepageproduct
- Zero Science Lab Disclosure (ZSL-2021-5647)third-party-advisory
- VulnCheck Advisory: ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpointthird-party-advisory
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