# CVE-2026-3337

## Summary

- **CVE ID:** CVE-2026-3337
- **Severity:** HIGH
- **CVSS Score:** 8.2 (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)
- **CWE:** CWE-208
- **Published:** Mar 2, 2026
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- AWS — AWS-LC (1.21.0)
- AWS — AWS-LC-FIPS (3.0.0)

## References

- [CNA](https://aws.amazon.com/security/security-bulletins/2026-005-AWS/)
- [CNA](https://github.com/aws/aws-lc/releases/tag/v1.69.0)
- [CNA](https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.08%
- **EPSS Percentile:** 62.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._