CVE & CISA-KEV Catalog

CVE-2026-3337

MEDIUM
5.9
CVSS v3
NVD

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.

CWE-208

How to fix

Remediation Available
amazon-efs-utilsAmazon
Fixed in:0:3.0.0-4.amzn2
Fixed in:0:3.0.0-4.amzn2
Fixed in:0:3.0.0-4.amzn2023
Fixed in:0:3.0.0-4.amzn2023
mount-s3Amazon
Fixed in:0:1.22.2-1.amzn2023
Fixed in:0:1.22.2-1.amzn2023
mount-s3-debuginfoAmazon
Fixed in:0:1.22.2-1.amzn2023
Fixed in:0:1.22.2-1.amzn2023
mount-s3-debugsourceAmazon
Fixed in:0:1.22.2-1.amzn2023
Fixed in:0:1.22.2-1.amzn2023

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityHigh
AvailabilityNone

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

Exploit Intelligence

1.08%probability of exploitation in 30 days
63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Vendor Advisory2
Release Notes1

Related Vulnerabilities

Other CWE-208 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2019-9494Medium5.93.9%-Fix
CVE-2019-16782Medium6.33.7%-Fix
CVE-2025-53940High8.53.2%--
CVE-2020-1926Medium5.92.5%-Fix
CVE-2021-43298Critical9.82.3%-Fix
CVE-2024-29995High8.11.5%-Fix

Common questions

How do I fix CVE-2026-3337?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-3337 being actively exploited?

Not that we know of. CVE-2026-3337 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 63% of all scored CVEs.

How severe is CVE-2026-3337?

CVE-2026-3337 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-3337 affect?

Published advisories record a fix for amazon-efs-utils (Amazon), mount-s3 (Amazon), mount-s3-debuginfo (Amazon), mount-s3-debugsource (Amazon). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.