Authenticated router crash via oversized submit-url value
Published Jul 25, 2025 · Updated Jul 25, 2025
Stack-based buffer overflow in the A702R 4.0.0-B20230721.1521 HTTP POST handler allows remote authenticated users to crash the router. The /boafrm/formOneKeyAccessButton handler copies an oversized submit-url form value into a fixed-size stack buffer without enforcing its destination bound. A valid management session is required, and the demonstrated consequence is a service interrupt rather than code execution.
Summary
What happened
Stack-based buffer overflow in the A702R 4.0.0-B20230721.1521 HTTP POST handler allows remote authenticated users to crash the router. The /boafrm/formOneKeyAccessButton handler copies an oversized submit-url form value into a fixed-size stack buffer without enforcing its destination bound. A valid management session is required, and the demonstrated consequence is a service interrupt rather than code execution.
The record
- CVE
- CVE-2025-8138
- Published
- Jul 25, 2025
- Updated
- Jul 25, 2025
- Vendor
- TOTOLINK
- Product
- A702R
- Classifications
- CWE-119, CWE-120, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 25, 2025CVE publishedPublication date reported by the CVE source.
- Jul 25, 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=4.0.0-B20230721.1521
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
- formOneKeyAccessButton oversized submit-url proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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