Memory corruption via Server header overflow
Published Aug 18, 2026 · Updated Aug 20, 2026
Stack-based buffer overflow in the HTTP header handler in TRENDnet TEW-WLC100 1v2.07b01 allows remote attackers to corrupt memory via the Server header. In /usr/nginx/sbin/nginx, FUN_0040da4c handles the Server header unsafely; the public PoC sends 68 filler bytes in that header and overwrites the saved return address on the stack. The issue is reachable over the device's HTTP management interface without authentication, and the published evidence supports reliable process compromise or crash even though no vendor root-cause analysis is public.
Summary
What happened
Stack-based buffer overflow in the HTTP header handler in TRENDnet TEW-WLC100 1v2.07b01 allows remote attackers to corrupt memory via the Server header. In /usr/nginx/sbin/nginx, FUN_0040da4c handles the Server header unsafely; the public PoC sends 68 filler bytes in that header and overwrites the saved return address on the stack. The issue is reachable over the device's HTTP management interface without authentication, and the published evidence supports reliable process compromise or crash even though no vendor root-cause analysis is public.
The record
- CVE
- CVE-2026-75784
- Published
- Aug 18, 2026
- Updated
- Aug 20, 2026
- Vendor
- TRENDnet
- Product
- TEW-WLC100
- Classifications
- T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1v2.07b01
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
- poc-nginx-overflow.pyproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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