CVE-2021-47741 json
ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint
published 2025-12-31 10 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-206085
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 10 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- exploit-db.com https://www.exploit-db.com/exploits/49737 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | 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 |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 8.7 | 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/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 |
Affected products
- Zblchina ZBL EPON ONU Broadband Router
Classification
- Weakness
-
- CWE-522 Insufficiently Protected Credentials
References
-
exploit-db.com
/exploits/49737
exploit
-
zblchina.com
product
-
web.archive.org
/web/20211220094023/http://www.wd-thailand.com/
product
-
zeroscience.mk
/en/vulnerabilities/ZSL-2021-5647.php
third-party-advisory
-
vulncheck.com
/advisories/zbl-epon-onu-broadband-router-vr-privilege-escalation-via-configuration-endpoint
third-party-advisory
Sources
- CVE List CVE-2021-47741
- NVD CVE-2021-47741
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