CVE-2021-47741
HIGH EPSS 15.8%
Published Dec 31, 20255mo ago · Modified Jun 17, 20261w ago
8.7 CVSS 4.0
Published Dec 31, 2025 5mo ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
15.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-522
References 5
- zblchina.com http://www.zblchina.com
- web.archive.org https://web.archive.org/web/20211220094023/http://www.wd-thailand.com/
- exploit-db.com https://www.exploit-db.com/exploits/49737
- vulncheck.com https://www.vulncheck.com/advisories/zbl-epon-onu-broadband-router-vr-privilege-escalation-via-configuration-endpoint
- zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5647.php
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.