Cyber Resilience

CVE-2026-3337

High

Published: 02 March 2026

Published
02 March 2026
Modified
11 March 2026
KEV Added
—
Patch
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CVSS Score v4 8.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0108 60.7th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-3337 is a high-severity Observable Timing Discrepancy (CWE-208) vulnerability in Amazon Aws Libcrypto. Its CVSS base score is 8.2 (High).

Operationally, ranked in the top 39.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

CWE(s)
CWE-208

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

Insufficient information to map techniques.
Confidence: LOW · MITRE ATT&CK Enterprise v19.0

Affected Assets

amazon
aws-lc-fips-sys
0.13.0 — 0.13.12
amazon
aws-lc-sys
0.14.0 — 0.38.0
amazon
aws libcrypto
1.21.0 — 1.69.0 · 3.0.0 — 3.2.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-30 Concealment and Misdirection
addresses: CWE-208

Timing randomization or delays can mask true operation timing and mislead timing-based attacks.

SC-31 Covert Channel Analysis
addresses: CWE-208

Observable timing discrepancies are a primary mechanism for constructing covert timing channels; analysis identifies and bounds them, limiting exploitation.

References