What’s Vulnerable › Vulnerabilities

CVE-2021-47741: ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-31 · updated 2026-06-17
• Weakness: CWE-522

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

• Zblchina ZBL EPON ONU Broadband Router: 1.0

References

• 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

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