Arm Trusted Firmware Out-of-Bounds Write Vulnerability

Are you affected?

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• cpe trustedfirmware/trusted firmware-mversion unspecified
• vendor Arm Trusted Firmwareversion unspecified

How to fix CVE-2021-27562

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Nov 17, 2021.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. May 25, 2021 · Catalog

   Detected

   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.

2. Nov 3, 2021 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Nov 17, 2021 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-2021-27562

  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.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-27562

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-27562

  30-day exploitation probability 3.1%

  first.org
• NIST NVDVulnerability recordCVE-2021-27562

  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.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-27562

  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 vuln

  vulncheck.com

References

• Vendor Advisory · developer.arm.com
• Permissions Required · git.trustedfirmware.org
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · unit42.paloaltonetworks.com
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · fortinet.com
• VulnCheck exploitation evidence · fortinet.com
• VulnCheck exploitation evidence · radware.com

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.