CVE-2017-12972

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

Metrics

CVSS 3.0 7.5/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-345

Affected software

No affected versions have been published.

Timeline

Published: Aug 20, 2017
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2017

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