Is CVE-2026-3337 in the CISA KEV catalog?

No. CVE-2026-3337 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-3337?

CVE-2026-3337 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2026-3337?

CVE-2026-3337 has an EPSS score of 1.08% (61th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3337?

Upgrade aws-lc-fips-sys to 0.13.12 or later. Fixes are available for 3 affected products.

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

aws-lc-fips-sysNVD

Affected:>= 0.13.0, < 0.13.12Fixed in:0.13.12CVE-2026-3337derived from NVD

aws-lc-sysNVD

Affected:>= 0.14.0, < 0.38.0Fixed in:0.38.0CVE-2026-3337derived from NVD

aws libcryptoNVD

Affected:>= 1.21.0, < 1.69.0Fixed in:1.69.0CVE-2026-3337derived from NVD

Affected:>= 3.0.0, < 3.2.0Fixed in:3.2.0CVE-2026-3337derived from NVD

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

61stpercentile

Moderate risk: more likely to be exploited than 61% of all known CVEs.

References

Vendor Advisory2

Release Notes1

github.com

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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 2026-03-11.