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CVE-2026-3337

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

MEDIUM
5.9
CVSS Score
Published: March 2, 2026 at 09:20 PM UTC
Updated: June 17, 2026 at 10:43 AM UTC
5 products affected across 2 vendorsAWS LibcryptoAWS Lc SysAWS Lc Fips Sys

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Severity
MEDIUM5.9
Exploit prediction
EPSS 1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

AWS Lc Fips Sys· Amazoncargo
95%
0.13.0 ≤ v < 0.13.12
AWS Lc Sys· Amazoncargo
95%
0.14.0 ≤ v < 0.38.0
AWS Libcrypto· Amazon
95%
1.21.0 ≤ v < 1.69.03.0.0 ≤ v < 3.2.0
AWS-LC· AWS
60%
1.21.0 ≤ v < 1.69.01.21.0
Affected range stops below 1.69.0, so it looks safe — our inference, not a vendor statement
AWS-LC-FIPS· AWS
60%
3.0.0 ≤ v < 3.2.03.0.0
Affected range stops below 3.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisory
Source: cverecord
https://aws.amazon.com/security/security-bulletins/2026-005-AWS/
PatchRelease Notes
Source: cverecord
https://github.com/aws/aws-lc/releases/tag/v1.69.0
Third Party AdvisoryVendor Advisory
Source: cverecord
https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMAMZN
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-208

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