How severe is CVE-2021-27562?

CVE-2021-27562 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-27562 being actively exploited?

Yes. CVE-2021-27562 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-27562?

CVE-2021-27562 affects Trustedfirmware Trusted Firmware-m. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27562?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-27562 have an EU (EUVD) identifier?

Yes. CVE-2021-27562 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-14313. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2021-27562 published?

CVE-2021-27562 was published on 2021-05-25 and last updated on 2026-06-17.

CVE-2021-27562

CVE-2021-27562 is a medium-severity vulnerability in Trustedfirmware Trusted Firmware-m with a CVSS 3.x base score of 5.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.9
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2021-14313
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Weakness: CWE-787
Affected product: Trustedfirmware Trusted Firmware-m
Published: 2021-05-25
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-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.
How severe is CVE-2021-27562?: CVE-2021-27562 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-27562 being actively exploited?: Yes. CVE-2021-27562 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-27562?: CVE-2021-27562 affects Trustedfirmware Trusted Firmware-m. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27562?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-27562 have an EU (EUVD) identifier?: Yes. CVE-2021-27562 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-14313. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2021-27562 published?: CVE-2021-27562 was published on 2021-05-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:trustedfirmware:trusted_firmware-m:*:*:*:*:*:*:*:*

More vulnerabilities in Trustedfirmware Trusted Firmware-m

CVE-2021-43619 — High (CVSS 7.8): Trusted Firmware M 1.4.x through 1.4.1 has a buffer overflow issue in the Firmware Update partition. In the IPC model,…
CVE-2023-40271 — High (CVSS 7.5): In Trusted Firmware-M through TF-Mv1.8.0, for platforms that integrate the CryptoCell accelerator, when the CryptoCell…
CVE-2021-32032 — High (CVSS 7.5): In Trusted Firmware-M through 1.3.0, cleaning up the memory allocated for a multi-part cryptographic operation (in the…
CVE-2021-40327 — Medium (CVSS 5.9): Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key…
CVE-2023-51712 — Medium (CVSS 4.7): An issue was discovered in Trusted Firmware-M through 2.0.0. The lack of argument verification in the logging subsystem…

All CVEs affecting Trustedfirmware Trusted Firmware-m →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →