PT-2021-4942 · Arm · Arm Trusted Firmware

Published 2021-02-26 · Updated 2026-06-05 · CVE-2021-27562

Positive Technologies (AI Summary)

CVSS v2.0

6.6

Medium

Base vector

AV:L/AC:L/Au:N/C:C/I:N/A:C

Name of the Vulnerable Software and Affected Versions Arm Trusted Firmware-M versions M through 1.2

Description The issue is related to an out-of-bounds write in the implementation of the NSPE (Non-secure Processing Environment) mode in Arm Trusted Firmware-M. This can cause a system halt, overwrite of secure data, or the printing out of secure data when calling secure functions under the NSPE handler mode. The vulnerability may allow an attacker to cause a denial of service or gain unauthorized access to protected information.

Recommendations For Arm Trusted Firmware-M versions M through 1.2, as a temporary workaround, consider restricting access to secure functions under the NSPE handler mode until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2021-05694

CVE-2021-27562

Affected Products

Arm Trusted Firmware

References · 11

• https://osv.dev/vulnerability/CVE-2021-27562 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05694 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-27562 · Security Note
• https://developer.arm.com/support/arm-security-updates · Vendor Advisory
• https://cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27562 · Note
• https://developer.arm.com/tools-and-software/open-source-software/firmware/trusted-firmware/trusted-firmware-m · Note
• https://t.me/cybersecuritytechnologies/2791 · Telegram Post
• https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rst · Note
• https://cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv · Note
• https://t.me/cveNotify/166271 · Telegram Post
• https://t.me/cybersecuritytechnologies/2925 · Telegram Post