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

CVE-2021-27562 · Severity: critical · CVSS 5.5 · Exploited in the wild · Published 2021-11-03

Arm Trusted Firmware-M contains an out-of-bounds write vulnerability when calling secure functions under the Non-Secure Processing Environment (NSPE) handler mode. A local attacker in the non-secure world can exploit this to trigger a system halt, overwrite secure data, or leak secure information.

Vendors: Arm.

Quick answers

Is CVE-2021-27562 exploited in the wild?
Yes. CVE-2021-27562 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-27562?
Critical severity, with a CVSS score of 5.5, published 3 November 2021.
Which products and versions are affected?
Arm Trusted Firmware-M up to and including 1.2.0; Yealink Device Management Server.
Is there a fix for CVE-2021-27562?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-27562 attacked?
It is attacked with local access, in device firmware.
Am I affected by CVE-2021-27562?
Check whether you run Arm Trusted Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Arm Trusted Firmware-M up to and including 1.2.0
  • Yealink Device Management Server

Timeline

  • 2021-05-25: disclosed: NVD Published Date
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: other: Advisory published date provided in report

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