CVE-2021-47741
Severity CVSS v4.0:
HIGH
Type:
CWE-522
Insufficiently Protected Credentials
Publication date:
31/12/2025
Last modified:
31/12/2025
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.
Impact
Base Score 4.0
8.70
Severity 4.0
HIGH
Base Score 3.x
7.50
Severity 3.x
HIGH
References to Advisories, Solutions, and Tools
- http://www.zblchina.com
- https://web.archive.org/web/20211220094023/http://www.wd-thailand.com/
- https://www.exploit-db.com/exploits/49737
- https://www.vulncheck.com/advisories/zbl-epon-onu-broadband-router-vr-privilege-escalation-via-configuration-endpoint
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5647.php