What’s Vulnerable › Vulnerabilities

CVE-2021-28846

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% 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-134

Description

A Format String vulnerablity exists in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03, which could let a remote malicious user cause a denial of service due to a logic bug at address 0x40dcd0 when calling fprintf with "%s: key len = %d, too long\n" format. The two variables seem to be put in the wrong order. The vulnerability could be triggered by sending the POST request to apply_cgi with a long and unknown key in the request body.

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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