Authenticated code execution via unchecked SSID copy
Published Aug 19, 2026 · Updated Aug 25, 2026
Stack-based buffer overflow in /sbin/mycli in TRENDnet TEW-755AP 20260702 allows remote authenticated users to execute code via a crafted SSID. FUN_401000 wraps strcpy and copies the UCI qcawifi SSID value into a fixed-size stack buffer without checking its length, allowing the saved return address to be overwritten. Low-privileged access to the network management path is required; successful exploitation grants control of the access-point firmware process and can compromise the device.
Summary
What happened
Stack-based buffer overflow in /sbin/mycli in TRENDnet TEW-755AP 20260702 allows remote authenticated users to execute code via a crafted SSID. FUN_401000 wraps strcpy and copies the UCI qcawifi SSID value into a fixed-size stack buffer without checking its length, allowing the saved return address to be overwritten. Low-privileged access to the network management path is required; successful exploitation grants control of the access-point firmware process and can compromise the device.
The record
- CVE
- CVE-2026-76589
- Published
- Aug 19, 2026
- Updated
- Aug 25, 2026
- Vendor
- TRENDnet
- Product
- TEW-755AP
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 19, 2026CVE publishedPublication date reported by the CVE source.
- Aug 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=20260702
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
- TEW-755AP mycli Wi-Fi SSID stack-overflow PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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