Authenticated router crash via unbounded credential formatting
Published Jul 14, 2025 · Updated Jul 14, 2025
Buffer overflow in UTT HiPER 840G 3.1.1-190328 allows remote authenticated users to crash the router through its management interface. The handler passes attacker-controlled userName and pw1 values to sprintf with no length check, overflowing a stack buffer. Valid management credentials are required, and the published proof of concept demonstrates a router service crash rather than verified code execution.
Summary
What happened
Buffer overflow in UTT HiPER 840G 3.1.1-190328 allows remote authenticated users to crash the router through its management interface. The handler passes attacker-controlled userName and pw1 values to sprintf with no length check, overflowing a stack buffer. Valid management credentials are required, and the published proof of concept demonstrates a router service crash rather than verified code execution.
The record
- CVE
- CVE-2025-7571
- Published
- Jul 14, 2025
- Updated
- Jul 14, 2025
- Vendor
- Shanghai Aitai Technology Co., Ltd.
- Product
- HiPER 840G
- Classifications
- CWE-120, CWE-119, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2025CVE publishedPublication date reported by the CVE source.
- Jul 14, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.1.1-190328
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
- Authenticated oversized userName POST proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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