CVE-2023-40271

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Summary

CVECVE-2023-40271
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-09-08 02:15:08 UTC
Updated2026-06-05 20:07:06 UTC
DescriptionIn Trusted Firmware-M through TF-Mv1.8.0, for platforms that integrate the CryptoCell accelerator, when the CryptoCell PSA Driver software Interface is selected, and the Authenticated Encryption with Associated Data Chacha20-Poly1305 algorithm is used, with the single-part verification function (defined during the build-time configuration phase) implemented with a dedicated function (i.e., not relying on usage of multipart functions), the buffer comparison during the verification of the authentication tag does not happen on the full 16 bytes but just on the first 4 bytes, thus leading to the possibility that unauthenticated payloads might be identified as authentic. This affects TF-Mv1.6.0, TF-Mv1.6.1, TF-Mv1.7.0, and TF-Mv1.8.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.001900000 probability, percentile 0.407510000 (date 2026-06-11)

Problem Types: CWE-697 | n/a

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Trustedfirmware Trusted Firmware-m 1.6.0 All All All
Operating System Trustedfirmware Trusted Firmware-m 1.6.1 All All All
Operating System Trustedfirmware Trusted Firmware-m 1.7.0 All All All
Operating System Trustedfirmware Trusted Firmware-m 1.8.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Releases — Trusted Firmware-M v1.6.1 documentation af854a3a-2127-422b-91ae-364da2661108 tf-m-user-guide.trustedfirmware.org Release Notes
cc3xx_partial_tag_compare_on_chacha20_poly1305.rst « security_advisories « security « docs - trusted-firmware-m.git - Trusted Firmware for M profile Arm CPUs af854a3a-2127-422b-91ae-364da2661108 git.trustedfirmware.org Exploit, Mitigation, Technical Description, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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