What’s Vulnerable › Vulnerabilities

CVE-2021-27562: Arm Trusted Firmware Out-of-Bounds Write Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-25 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• TrustedFirmware Trusted Firmware-M: through 1.2.0

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://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

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