CVE-2021-27562
MediumExploitedPublic exploitIn 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.
Published May 25, 2021 · Updated Jun 5, 2026
Key Facts
Patch immediately- CVE-2021-27562 is a medium-severity vulnerability (CVSS 5.5 v3.1) affecting Trusted Firmware-M (Arm).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 15, 2021. Public exploit code is available.
- EPSS estimates a 3.1% probability of exploitation in the next 30 days.
- Fixed versions are available, including Trusted Firmware-M <=1.2.0, trustedfirmware trusted firmware-m 1.2.0, Trusted Firmware-M 1.2.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
3.1%
Higher than 87.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-27562 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Mar 15, 2021 | Nov 17, 2021 | Not reported |
| CIRCL KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Trusted Firmware-MArm | See advisory | 1.2.0 |
Patched Releases
Trusted Firmware-M
<=1.2.0
trustedfirmware trusted firmware-m
1.2.0
Timeline
Added to Industry KEV feed
Mar 15, 2021
Publicly disclosed
May 25, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Jun 5, 2026
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryhttps://developer.arm.com/support/arm-security-updates
- advisoryhttps://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rst
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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: Trusted Firmware-M (Arm). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 15, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Trusted Firmware-M <=1.2.0, trustedfirmware trusted firmware-m 1.2.0, Trusted Firmware-M 1.2.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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