CVE-2021-28846

Name: CVE-2021-28846
Creator: NVD / NIST
Published: 2021-08-10T20:15:08.417+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2021-28846 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.81%

52.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-134

Affected Software

Vendor	Product	Versions
Trendnet	Tew-755ap Firmware	1.11b03
Trendnet	Tew-755ap2kac 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.pdfThird Party Advisory
https://github.com/zyw-200/EQUAFL/blob/main/TRENDnet%20ticket.pdfThird Party Advisory

Timeline

Published: Aug 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28846?

How severe is CVE-2021-28846?

CVE-2021-28846 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28846?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28846?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST