November 3, 2021 · Applied Cybernetics Group
CVE-2021-27562 — Arm Trusted Firmware
Arm Trusted Firmware Out-of-Bounds Write Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Arm
- Product
- Trusted Firmware
- EPSS
- 86.2th percentile (score 0.031, as of
2026-07-13) - NVD CVSS v3.1
- 5.5 (MEDIUM)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-27562
CISA short description
Arm Trusted Firmware contains an out-of-bounds write vulnerability allowing the non-secure (NS) world to trigger a system halt, overwrite secure data, or print out secure data when calling secure functions under the non-secure processing environment (NSPE) handler mode. This vulnerability affects Yealink Device Management servers.
Required action
Apply updates per vendor instructions.
NVD description
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.