CVE DATABASE / CVE-2021-27562
CVE-2021-27562
Arm Trusted Firmware Out-of-Bounds Write Vulnerability
CVSS 5.5 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2021-11-17.
Required action: Apply updates per vendor instructions.
Summary
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.
CVSS 3.1 breakdown
| Base score | 5.5 (MEDIUM) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity | NONE |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Arm trusted firmware-m
Check this CVE live
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- https://developer.arm.com/support/arm-security-updates
- https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rst
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27562
Data: NIST NVD + CISA KEV. NVD last modified 2025-11-03. Always verify against the vendor advisory before acting.