CVE-2026-3337

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

Published Mar 2, 2026 CVSS 4.0 · 8.2 High EPSS 1.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Amazon
Amazon aws-lc-fips-sys
Amazon aws-lc-sys
Amazon aws Libcrypto
CPEs cpe:2.3:a:aws:aws_libcrypto:*:*:*:*:*:*:*:*
cpe:2.3:a:aws:aws_libcrypto:*:*:*:*:fips:*:*:*
cpe:2.3:a:amazon:aws-lc-fips-sys:*:*:*:*:*:rust:*:*
cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:*
cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:*
cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:fips:*:*:*
Vendors & Products Aws aws Libcrypto
Amazon
Amazon aws-lc-fips-sys
Amazon aws-lc-sys
Amazon aws Libcrypto
Type Values Removed Values Added
First Time appeared Aws aws Libcrypto
CPEs cpe:2.3:a:aws:aws_libcrypto:*:*:*:*:*:*:*:*
cpe:2.3:a:aws:aws_libcrypto:*:*:*:*:fips:*:*:*
Vendors & Products Aws aws Libcrypto
Type Values Removed Values Added
First Time appeared Aws
Aws aws-lc
Aws aws-lc-fips
Vendors & Products Aws
Aws aws-lc
Aws aws-lc-fips
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Timing Side-Channel in AES-CCM Tag Verification in AWS-LC
Weaknesses CWE-208
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Mar 3, 2026, 8:04 PM
Reserved
Feb 27, 2026, 3:16 PM
Status
Analyzed
Published
Mar 2, 2026, 10:16 PM
Modified
Jun 17, 2026, 10:43 AM
Severity
Moderate
Public date
Mar 2, 2026, 9:20 PM