CVE-2021-28845

Name: CVE-2021-28845
Creator: NVD / NIST
Published: 2021-08-10T20:15:08.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.96%

Last modified Jun 17, 2026

CVE-2021-28845 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Null Pointer Dereference vulnerability 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 by sending the POST request to apply_cgi via the lang action without a language key.. EPSS estimates a 0.96% chance of exploitation in the next 30 days.

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, which could let a remote malicious user cause a denial of service by sending the POST request to apply_cgi via the lang action without a language key.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.96%

57.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

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-2021-28845?

How severe is CVE-2021-28845?

CVE-2021-28845 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.96% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28845?

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-2021-28845?

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

Scan your code now

Source: NVD / NIST