CVE-2021-27562
Published on May 25, 2021

In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an overwrite of secure data, or the printing out of secure data when calling secure functions under the NSPE handler mode.

Vendor Advisory NVD

Known Exploited Vulnerability

This Arm Trusted Firmware M through 1.2 Denial-of-Service vulnerability is part of CISA's list of Known Exploited Vulnerabilities. In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an overwrite of secure data, or the printing out of secure data when calling secure functions under the NSPE handler mode. This vulnerability has known active exploitation against Yealink Device Management servers. It is assessed this product utilizes the affected Arm firmware.

The following remediation steps are recommended / required by November 17, 2021: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2021-27562 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2021-27562 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2021-27562

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What versions are vulnerable to CVE-2021-27562?

Each of the following must match for the vulnerability to exist.