CVE-2021-47741 ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint
Limited administrative users can escalate privileges by accessing configuration endpoints to disclose the super user password on ZBL EPON ONU Broadband Routers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47741?
CVE-2021-47741 is a high-severity vulnerability in Zblchina ZBL EPON ONU Broadband Router, published on 31 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-522
Which versions are affected by CVE-2021-47741?
How do I fix CVE-2021-47741?
No fix has been published for CVE-2021-47741 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-47741 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47741 exists.
Sources
Also known as GHSA-chph-r4jm-2932.