Authenticated code execution via unchecked rm_port copy
Published Aug 27, 2025 · Updated Aug 27, 2025
Stack-based buffer overflow in Linksys E1700 firmware 1.0.0.4.003 allows remote authenticated users to execute arbitrary code. The setSysAdm function in mod_form.so copies the rm_port form value into a fixed-size stack buffer without a length check, overwriting its return address. Access requires valid router-administration credentials; an oversized HTTP POST can crash the router or redirect execution.
Summary
What happened
Stack-based buffer overflow in Linksys E1700 firmware 1.0.0.4.003 allows remote authenticated users to execute arbitrary code. The setSysAdm function in mod_form.so copies the rm_port form value into a fixed-size stack buffer without a length check, overwriting its return address. Access requires valid router-administration credentials; an oversized HTTP POST can crash the router or redirect execution.
The record
- CVE
- CVE-2025-9526
- Published
- Aug 27, 2025
- Updated
- Aug 27, 2025
- Vendor
- Linksys
- Product
- E1700 N300 Wi-Fi Router
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 27, 2025CVE publishedPublication date reported by the CVE source.
- Aug 27, 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=1.0.0.4.003
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
- Authenticated rm_port oversized-request 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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