Authenticated code execution via unchecked ruleName copy
Published Aug 22, 2025 · Updated Aug 25, 2025
Stack-based buffer overflow in Linksys RE-series extenders allows remote authenticated users to execute code via crafted ruleName input. The scheduleAdd function in mod_form.so copies ruleName from /goform/scheduleAdd into a fixed-size stack variable without checking its length, overwriting the return address. A valid management session is required; an oversized value demonstrably crashes the appliance, while return-address control enables arbitrary code execution.
Summary
What happened
Stack-based buffer overflow in Linksys RE-series extenders allows remote authenticated users to execute code via crafted ruleName input. The scheduleAdd function in mod_form.so copies ruleName from /goform/scheduleAdd into a fixed-size stack variable without checking its length, overwriting the return address. A valid management session is required; an oversized value demonstrably crashes the appliance, while return-address control enables arbitrary code execution.
The record
- CVE
- CVE-2025-9355
- Published
- Aug 22, 2025
- Updated
- Aug 25, 2025
- Vendor
- Linksys
- Product
- RE6250
- Classifications
- CWE-121, CWE-119, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 22, 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
- scheduleAdd oversized ruleName proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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