CVE-2021-40327: trustedfirmware trusted_firmware-m Missing Authorization
CVSS: 5.9v3.1MediumModified
AliasesUBUNTU-CVE-2021-40327
Published 13-01-2022Last modified 04-08-2024
Vulnerability summary
CVE-2021-40327 is a medium (CVSS 5.9) Missing Authorization vulnerability in trustedfirmware trusted_firmware-m. EPSS estimates a 1.19% chance of exploitation in the next 30 days, higher than 67.6% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v3.1 (NVD)EPSS score
1.19%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 13-01-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key (held by the Crypto service) based solely on knowledge of its key ID. For example, there is no authorization check associated with the relationship between a caller and a key owner.
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 5.9Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Low 2.6Preferred score · NVD (NIST)
AV:N/AC:H/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
1.19%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
0.00 pp
From 1.19% on 20-09-2026
20-09-202620-10-2026
EPSS score1.19%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Trustedfirmware1 product
- trusted_firmware-m1.4.0
Ubuntu1 product
- arm-trusted-firmwareAll versions (No fix recorded)
2 vendors · 2 products