VulnerabilityAnalyzed
CVE-2021-27562
Arm Trusted Firmware Out-of-Bounds Write Vulnerability
KEVMEDIUM 5.5EPSS 3.09%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.09% probability · 87th percentile
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Weakness
- CWE-787
- Affected
- trustedfirmware/trusted firmware-m
- Source
- cve@mitre.org
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-27562
References
- https://developer.arm.com/support/arm-security-updatesVendor Advisory
- https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rstPermissions Required, Third Party Advisory
- https://developer.arm.com/support/arm-security-updatesVendor Advisory
- https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rstPermissions Required, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27562US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.