CVE-2021-28843

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-10 · updated 2026-06-17
Weakness: CWE-476

Description

Null Pointer Dereference vulnerability exists in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03 by sending the POST request to apply_cgi with an unknown action name.

Affected products

TRENDnet Tew-755Ap2Kac Firmware: 1.11b03
TRENDnet Tew-755Ap Firmware: 1.11b03
TRENDnet Tew-821Dap2Kac Firmware: 1.11b03
TRENDnet Tew-825Dap Firmware: 1.11b03

References

https://github.com/zyw-200/EQUAFL/blob/main/TRENDnet%20ticket.pdf
https://github.com/zyw-200/EQUAFL/blob/main/TRENDnet%20ticket.pdf

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