Authenticated code execution via unchecked language parameter
Published Aug 23, 2025 · Updated Aug 25, 2025
Stack-based buffer overflow in Linksys RE-series extenders allows remote authenticated users to execute code or crash the device. The langSwitchByBBS handler in mod_form.so copies attacker-controlled langSelectionOnly data into a fixed-size stack variable without bounds checking, overwriting the return address. A valid management session is required; the public proof of concept demonstrates persistent service interruption, while code execution follows from documented return-address control.
Summary
What happened
Stack-based buffer overflow in Linksys RE-series extenders allows remote authenticated users to execute code or crash the device. The langSwitchByBBS handler in mod_form.so copies attacker-controlled langSelectionOnly data into a fixed-size stack variable without bounds checking, overwriting the return address. A valid management session is required; the public proof of concept demonstrates persistent service interruption, while code execution follows from documented return-address control.
The record
- CVE
- CVE-2025-9357
- Published
- Aug 23, 2025
- Updated
- Aug 25, 2025
- Vendor
- Linksys
- Product
- RE6250
- Classifications
- CWE-121, CWE-119, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 23, 2025CVE publishedPublication date reported by the CVE source.
- Aug 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=1.0.013.001
- Affected versionversion=1.0.04.001
- Affected versionversion=1.0.04.002
- Affected versionversion=1.1.05.003
- Affected versionversion=1.2.07.001
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
- Overlong langSelectionOnly POST proof of conceptfunctional · demonstrated
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Technologies
Your stack
See the directory against your own environment.
Your stack
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