CVE-2017-12972
Nimbus JOSE+JWT missing overflow check
7.5
HIGH
CVSS 3.1
EPSS 0.15%
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.
How to fix CVE-2017-12972
To remediate CVE-2017-12972, upgrade the affected package to a fixed version below.
- —upgrade to 4.39 or later
Is CVE-2017-12972 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 4.39
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |