CVE-2026-3337— Timing Side-Channel in AES-CCM Tag Verification in AWS-LC
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I. Basic Information for CVE-2026-3337
Vulnerability Information
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Vulnerability Title
Timing Side-Channel in AES-CCM Tag Verification in AWS-LC
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过时间差异性导致的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
AWS libcrypto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS libcrypto是Amazon Web Services开源的一个通用加密库。 AWS libcrypto 1.69.0之前版本存在安全漏洞，该漏洞源于AES-CCM解密存在可观察的时间差异，可能允许通过时序分析确定身份验证标签的有效性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| AWS | AWS-LC | 1.21.0 ~ 1.69.0 | - | |
| AWS | AWS-LC-FIPS | 3.0.0 ~ 3.2.0 | - |
II. Public POCs for CVE-2026-3337
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · AWS · 2026-03-02 · 3 CVEs total
| CVE-2026-3336 | 7.5 HIGH | PKCS7_verify Certificate Chain Validation Bypass in AWS-LC |
| CVE-2026-3338 | 7.5 HIGH | PKCS7_verify Signature Validation Bypass in AWS-LC |
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V. Comments for CVE-2026-3337
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