CVE-2026-3337

Name: CVE-2026-3337
Creator: NVD / NIST
Published: 2026-03-02T22:16:32.093+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2026-3337 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

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

CVSS 4.0

8.2/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

1.08%

60.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-208

Affected Software

Vendor	Product	Versions
Amazon	Aws-Lc-Fips-Sys	>= 0.13.0, < 0.13.12
Amazon	Aws-Lc-Sys	>= 0.14.0, < 0.38.0
Amazon	Aws Libcrypto	>= 1.21.0, < 1.69.0
Amazon	Aws Libcrypto	>= 3.0.0, < 3.2.0

References

https://aws.amazon.com/security/security-bulletins/2026-005-AWS/Vendor Advisory
https://github.com/aws/aws-lc/releases/tag/v1.69.0Release Notes
https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxhVendor Advisory

Timeline

Published: Mar 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3337?

How severe is CVE-2026-3337?

CVE-2026-3337 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3337?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3337?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST