CVE-2026-3337: Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

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.

CVSS vector

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

Attack vector

Network

Complexity

High

Privileges

None

User interaction

None

Confidentiality

None

Integrity

High

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)1.1% · higher than 66% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

AW

AWS-LC · AWS

1.21.0 before 1.69.0 · source: vendor

AW

AWS-LC-FIPS · AWS

3.0.0 before 3.2.0 · source: vendor

AL

Aws Libcrypto · Amazon

1.21.0 before 1.69.0; 3.0.0 before 3.2.0 · source: NVD

AW

Aws-lc-fips-sys · Amazon

0.13.0 before 0.13.12 · source: NVD

AW

Aws-lc-sys · Amazon

0.14.0 before 0.38.0 · source: NVD