Device crash via unchecked IPv6 prefix copy
Published Aug 26, 2025 · Updated Aug 26, 2025
Stack-based buffer overflow in Linksys RE-series range extenders allows remote authenticated users to crash the device via an IPv6 request. The setIpv6 handler in mod_form.so copies the attacker-controlled tunrd_Prefix value from a POST to /goform/setIpv6 into a local buffer without length validation, overwriting adjacent control data. A valid management session is required; the proof of concept demonstrates a persistent service crash, while code execution is asserted but not demonstrated.
Summary
What happened
Stack-based buffer overflow in Linksys RE-series range extenders allows remote authenticated users to crash the device via an IPv6 request. The setIpv6 handler in mod_form.so copies the attacker-controlled tunrd_Prefix value from a POST to /goform/setIpv6 into a local buffer without length validation, overwriting adjacent control data. A valid management session is required; the proof of concept demonstrates a persistent service crash, while code execution is asserted but not demonstrated.
The record
- CVE
- CVE-2025-9481
- Published
- Aug 26, 2025
- Updated
- Aug 26, 2025
- Vendor
- Linksys
- Product
- RE6250
- Classifications
- CWE-121, CWE-119, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 26, 2025CVE publishedPublication date reported by the CVE source.
- Aug 26, 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
- setIpv6 tunrd_Prefix 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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