Vulnerability in Zblchina Zbl Epon Onu Broadband Router
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Zblchina Zbl Epon Onu Broadband Router — versions 1.0
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49737 (exploit)
- www.zblchina.com (product)
- web.archive.org/web/20211220094023/http://www.wd-thailand.com/ (product)
- www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5647.php (third-party-advisory)
- www.vulncheck.com/advisories/zbl-epon-onu-broadband-router-vr-privilege-escalat… (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47741?
- CVE-2021-47741 is a high-severity vulnerability in Zblchina Zbl Epon Onu Broadband Router, classified under Insufficiently Protected Credentials. CVSS score: 7.5/10. Published 2025-12-31.
- How severe is CVE-2021-47741?
- High severity. CVSS v3 base score is 7.5 out of 10.