Authenticated service crash via unchecked submit-url copy
Published May 25, 2026 · Updated May 25, 2026
Stack-based buffer overflow in Edimax EW-7438RPn 1.31 allows remote authenticated users to crash its web service via HTTP. The formLogout handler in the webs binary copies an overlong submit-url value into a local stack variable without length validation, overwriting the saved return address. Access to the HTTP management interface with valid Basic authentication is required; the published proof of concept demonstrates a persistent router service crash, not code execution.
Summary
What happened
Stack-based buffer overflow in Edimax EW-7438RPn 1.31 allows remote authenticated users to crash its web service via HTTP. The formLogout handler in the webs binary copies an overlong submit-url value into a local stack variable without length validation, overwriting the saved return address. Access to the HTTP management interface with valid Basic authentication is required; the published proof of concept demonstrates a persistent router service crash, not code execution.
The record
- CVE
- CVE-2026-9479
- Published
- May 25, 2026
- Updated
- May 25, 2026
- Vendor
- Edimax Technology Co., Ltd.
- Product
- EW-7438RPn
- Classifications
- CWE-121, CWE-119, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 25, 2026CVE publishedPublication date reported by the CVE source.
- May 25, 2026Record 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=1.31
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
- EW-7438RPn formLogout HTTP proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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