CVSS 3.1 Score 7.5 of 10 (high)


Published Sep 8, 2023
Updated: Sep 13, 2023
CWE ID 697


CVE-2023-40271 is a vulnerability found in Trusted Firmware-M versions 1.6.0 through 1.8.0. The vulnerability affects platforms that integrate the CryptoCell accelerator and use the Authenticated Encryption with Associated Data Chacha20-Poly1305 algorithm with the single-part verification function. The issue lies in the buffer comparison during the verification of the authentication tag, which only occurs on the first 4 bytes instead of the full 16 bytes. This could potentially allow unauthenticated payloads to be identified as authentic. The vulnerability has a base severity rating of HIGH and an exploitability score of 3.9 according to [email protected]. No analysis description is available at this time, and remediation steps are not provided in the source text.


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