CVE-2026-3337

high

Description

Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

References

https://aws.amazon.com/security/security-bulletins/2026-005-AWS/

https://aws.amazon.com/security/security-bulletins/rss/2026-005-aws/

https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh

https://github.com/aws/aws-lc/releases/tag/v1.69.0

Details

Source: Mitre, NVD

Published: 2026-03-02

Updated: 2026-03-02

Risk Information

CVSS v2

Base Score: 5.4

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:N

Severity: Medium

CVSS v3

Base Score: 5.9

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

Severity: Medium

CVSS v4

Base Score: 8.2

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Severity: High