Authenticated device crash via unchecked rule copy
Published Aug 20, 2025 · Updated Aug 20, 2025
Stack-based buffer overflow in Linksys RE-series firmware allows remote authenticated users to crash the device through crafted rules. The check_port_conflict handler in mod_form.so copies oversized single_port_rule or port_range_rule input into a stack-local buffer without a length check, overwriting the function return address. A valid session and low-privilege access are required; the published proof of concept demonstrates a persistent service crash.
Summary
What happened
Stack-based buffer overflow in Linksys RE-series firmware allows remote authenticated users to crash the device through crafted rules. The check_port_conflict handler in mod_form.so copies oversized single_port_rule or port_range_rule input into a stack-local buffer without a length check, overwriting the function return address. A valid session and low-privilege access are required; the published proof of concept demonstrates a persistent service crash.
The record
- CVE
- CVE-2025-9246
- Published
- Aug 20, 2025
- Updated
- Aug 20, 2025
- Vendor
- Linksys
- Product
- RE6250
- Classifications
- CWE-121, CWE-119, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 20, 2025CVE publishedPublication date reported by the CVE source.
- Aug 20, 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
- Linksys check_port_conflict crash proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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