CVE-2021-47741ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint
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It affects Zblchina ZBL EPON ONU Broadband Router. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-522
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Jan 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Zblchina ZBL EPON ONU Broadband Router zblchina:zbl_epon_onu_broadband_router (from the name) | 1.0 | CNA record |
References
- https://www.exploit-db.com/exploits/49737exploit
- http://www.zblchina.comproduct
- https://web.archive.org/web/20211220094023/http://www.wd-thailand.com/product
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5647.phpthird-party-advisory
- https://www.vulncheck.com/advisories/zbl-epon-onu-broadband-router-vr-privilege-escalation-via-configuration-endpointthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.