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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00085.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS AWS-LC unaffected
Version Status Constraints
1.21.0 affected < 1.69.0
AWS AWS-LC-FIPS unaffected
Version Status Constraints
3.0.0 affected < 3.2.0

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-005-AWS/ cve-icon cve-icon
https://github.com/aws/aws-lc/releases/tag/v1.69.0 cve-icon cve-icon
https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh cve-icon cve-icon
History

Tue, 03 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Mon, 02 Mar 2026 22:30:00 +0000

Type Values Removed Values Added
References

Mon, 02 Mar 2026 21:45:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-03-03T20:04:27.577Z

Reserved: 2026-02-27T15:16:28.371Z

Link: CVE-2026-3337

cve-icon Vulnrichment

Updated: 2026-03-03T20:03:15.485Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-02T22:16:32.093

Modified: 2026-03-03T21:52:29.877

Link: CVE-2026-3337

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses