CVE-2021-47741

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 v4.0

8.7 HIGHCVSS: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

CVSS v3.1

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.28% chance of exploitation in the next 30 days, 20th percentile

Published

2025-12-31

Updated

2026-01-02

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/49737

References

• CVE Record
• NVD entry

Related

• CVE-2021-47740
• CVE-2021-47742
• CVE-2021-47739
• CVE-2021-47743
• CVE-2021-47738
• CVE-2021-47744