PT-2021-17957 · Trendnet · Trendnet Tew-821Dap2Kac+3

Published 2021-08-10 · Updated 2021-08-16 · CVE-2021-28841

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: TRENDnet TEW-755AP version 1.11B03 TRENDnet TEW-755AP2KAC version 1.11B03 TRENDnet TEW-821DAP2KAC version 1.11B03 TRENDnet TEW-825DAP version 1.11B03

Description: The issue allows a remote malicious user to cause a denial of service by sending a POST request to "apply cgi" via an action "ping test" without a ping ipaddr key. This could lead to a Null Pointer Dereference.

Recommendations: For TRENDnet TEW-755AP version 1.11B03, consider disabling the "apply cgi" endpoint until a patch is available. For TRENDnet TEW-755AP2KAC version 1.11B03, restrict access to the "apply cgi" endpoint to minimize the risk of exploitation. For TRENDnet TEW-821DAP2KAC version 1.11B03, avoid using the "ping test" action in the "apply cgi" endpoint without a ping ipaddr key until the issue is resolved. For TRENDnet TEW-825DAP version 1.11B03, as a temporary workaround, consider disabling the "apply cgi" endpoint via the "ping test" action until a patch is available.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2021-28841

Affected Products

Trendnet Tew755Ap

Trendnet Tew-755Ap2Kac

Trendnet Tew-821Dap2Kac

Trendnet Tew-825Dap

References · 4

• https://osv.dev/vulnerability/CVE-2021-28841 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-28841 · Security Note
• https://github.com/zyw-200/EQUAFL/blob/main/TRENDnet%20ticket.pdf · Note
• https://t.me/cvenotify/19039 · Telegram Post