Authenticated code execution via unchecked username copy
Published Jul 6, 2025 · Updated Jul 7, 2025
Stack-based buffer overflow in Belkin F9K1122 1.00.33 allows remote authenticated users to crash the device via a crafted WAN username. The webs formWanTcpipSetup handler copies an overlong pppUserName value into a stack-local buffer without checking its length, overwriting the function return address. Access to the browser-based management handler is required; the published request demonstrates a persistent service interruption, while the report states that return-address control enables arbitrary code execution.
Summary
What happened
Stack-based buffer overflow in Belkin F9K1122 1.00.33 allows remote authenticated users to crash the device via a crafted WAN username. The webs formWanTcpipSetup handler copies an overlong pppUserName value into a stack-local buffer without checking its length, overwriting the function return address. Access to the browser-based management handler is required; the published request demonstrates a persistent service interruption, while the report states that return-address control enables arbitrary code execution.
The record
- CVE
- CVE-2025-7089
- Published
- Jul 6, 2025
- Updated
- Jul 7, 2025
- Vendor
- Belkin
- Product
- Belkin F9K1122
- Classifications
- CWE-119, CWE-121, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 6, 2025CVE publishedPublication date reported by the CVE source.
- Jul 7, 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=1.00.33
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
- F9K1122 pppUserName crash proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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