CVE-2026-3337 PUBLISHED

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

Assigner: AMZN
Reserved: 27.02.2026 Published: 02.03.2026 Updated: 02.03.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS Score: 5.9

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

CVSS 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
CVSS Score: 8.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	AWS
Product	AWS-LC
Versions	Default: unaffected affected from 1.21.0 to 1.69.0 (excl.)

Vendor	AWS
Product	AWS-LC-FIPS
Versions	Default: unaffected affected from 3.0.0 to 3.2.0 (excl.)

CVE-2026-3337 PUBLISHED

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

Metrics

Product Status

References

Problem Types

Impacts