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

Quick assessment

Affected
AWS AWS-LC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.9 · Medium EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1595.001 · Scanning IP Blocks
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-3337

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Vendor Advisories for CVE-2026-3337 (2)

Vendor Pages for CVE-2026-3337 (1)

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

IV. Related Vulnerabilities

Same product: AWS-LC
Same vendor: AWS
Same weakness: CWE-208

V. Comments for CVE-2026-3337

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