Privilege escalation via exposed super-user password
Published Dec 31, 2025 · Updated Dec 31, 2025
Privilege escalation in ZBL EPON ONU Broadband Router V100R001 allows remote authenticated users to obtain super-user access. The configuration backup endpoint and system_password.asp page return the super account password to a limited administrative session without enforcing the super-user privilege boundary. A limited admin can then authenticate as super and use additional privileged management functions; the disclosed evidence does not establish unauthenticated reachability.
Summary
What happened
Privilege escalation in ZBL EPON ONU Broadband Router V100R001 allows remote authenticated users to obtain super-user access. The configuration backup endpoint and system_password.asp page return the super account password to a limited administrative session without enforcing the super-user privilege boundary. A limited admin can then authenticate as super and use additional privileged management functions; the disclosed evidence does not establish unauthenticated reachability.
The record
- CVE
- CVE-2021-47741
- Published
- Dec 31, 2025
- Updated
- Dec 31, 2025
- Vendor
- Zhejiang BC&TV Technology Co., Ltd.
- Product
- ZBL EPON ONU Broadband Router
- Classifications
- CWE-522, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 31, 2025CVE publishedPublication date reported by the CVE source.
- Dec 31, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- ZBL EPON ONU Broadband Router 1.0 Remote Privilege Escalationfunctional · demonstrated
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Technologies
Your stack
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Your stack
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