Vulnerability details
CVE-2021-47741
Zblchina ZBL EPON ONU Broadband Router
ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint
CVSS 4.0
8.7High
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Zblchina | ZBL EPON ONU Broadband Router | 1.0 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://www.exploit-db.com/exploits/49737 exploit
- http://www.zblchina.com product
- https://web.archive.org/web/20211220094023/http://www.wd-thailand.com/ product
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5647.php third-party-advisory
- https://www.vulncheck.com/advisories/zbl-epon-onu-broadband-router-vr-privilege-escalation-via-configuration-endpoint third-party-advisory
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Details
- Published
- 2025-12-31
- Last updated
- 2026-01-02
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.28%
Probability of exploitation in 30 days
21.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-522Insufficiently Protected Credentials