What is CVE-2026-3337?

CVE-2026-3337 is a medium-severity vulnerability in Aws Aws-lc, classified under CWE-208. CVSS score: 5.9/10. Published 2026-03-02.

How severe is CVE-2026-3337?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Aws Aws-lc

CVE-2026-3337

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…

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Aws Aws-lc — versions 1.21.0
Aws Aws-lc-fips — versions 3.0.0

Weakness classification (CWE)

CWE-208

References

aws.amazon.com/security/security-bulletins/2026-005-AWS/ (vendor-advisory)
github.com/aws/aws-lc/releases/tag/v1.69.0 (patch)
github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh (third-party-advisory)

Frequently asked questions

What is CVE-2026-3337?: CVE-2026-3337 is a medium-severity vulnerability in Aws Aws-lc, classified under CWE-208. CVSS score: 5.9/10. Published 2026-03-02.
How severe is CVE-2026-3337?: Medium severity. CVSS v3 base score is 5.9 out of 10.