How severe is CVE-2026-3337?

CVE-2026-3337 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-3337 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3337?

CVE-2026-3337 primarily affects Amazon Aws-lc-fips-sys. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-3337?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3337 have an EU (EUVD) identifier?

Yes. CVE-2026-3337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9265.

When was CVE-2026-3337 published?

CVE-2026-3337 was published on 2026-03-02 and last updated on 2026-06-17.

CVE-2026-3337

CVE-2026-3337 is a medium-severity vulnerability in Amazon Aws-lc-fips-sys with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-208.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v4: 8.2
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9265
Weakness: CWE-208
Affected product: Amazon Aws-lc-fips-sys
Published: 2026-03-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-3337?: 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.
How severe is CVE-2026-3337?: CVE-2026-3337 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-3337 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3337?: CVE-2026-3337 primarily affects Amazon Aws-lc-fips-sys. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-3337?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3337 have an EU (EUVD) identifier?: Yes. CVE-2026-3337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9265.
When was CVE-2026-3337 published?: CVE-2026-3337 was published on 2026-03-02 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:amazon:aws-lc-fips-sys:*:*:*:*:*:rust:*:*
cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:*
cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:*
cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:fips:*:*:*

Other CWE-208 vulnerabilities

CVE-2023-41313 — Critical (CVSS 9.8): The authentication method in Apache Doris versions before 2.0.0 was vulnerable to timing attacks. Users are recommended…
CVE-2024-42512 — High (CVSS 8.6): Vulnerability in the OPC UA .NET Standard Stack before 1.5.374.158 allows an unauthorized attacker to bypass…
CVE-2025-53940 — High (CVSS 8.5): Quiet is an alternative to team chat apps like Slack, Discord, and Element that does not require trusting a central…
CVE-2026-47784 — High (CVSS 8.1): In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because…
CVE-2026-47783 — High (CVSS 8.1): In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a…
CVE-2026-42602 — High (CVSS 8.1): azureauthextension is the Azure Authenticator Extension. From 0.124.0 to 0.150.0, a server-side authentication bypass…

Browse all CWE-208 vulnerabilities →