Authenticated code execution via unchecked LAN setting
Published Aug 10, 2025 · Updated Aug 12, 2025
Stack-based buffer overflow in Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 allows remote authenticated users to crash devices. The setLan handler stores an unchecked lan2enabled value through nvram_bufset; setWan later copies it into a stack local and overwrites its return address. A valid management session is required, and the demonstrated consequence is persistent service loss, although return-address control also permits arbitrary code execution.
Summary
What happened
Stack-based buffer overflow in Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 allows remote authenticated users to crash devices. The setLan handler stores an unchecked lan2enabled value through nvram_bufset; setWan later copies it into a stack local and overwrites its return address. A valid management session is required, and the demonstrated consequence is persistent service loss, although return-address control also permits arbitrary code execution.
The record
- CVE
- CVE-2025-8817
- Published
- Aug 10, 2025
- Updated
- Aug 12, 2025
- Vendor
- Linksys
- Product
- RE6250
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 10, 2025CVE publishedPublication date reported by the CVE source.
- Aug 12, 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=20250801
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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 setLan and setWan HTTP proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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