CVE-2026-3337CWE-208

Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

High · published March 2, 2026

CVSS v4.0
8.2
EPSS
0%
Percentile
41.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.2 · HIGH
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
EPSS
0.00494 · 41.5th percentile
Weakness
CWE-208 · Observable Timing Discrepancy
Published
2026-03-02T21:20Z
EPSS history
Timeline
  • 02 MAR 21:20Z
    Timing Side-Channel in AES-CCM Tag Verification in AWS-LC
    cvelistv5