CVE-2024-37880

HIGH
7.5
CVSS Score
Published: June 10, 2024 at 12:00 AM UTC
Updated: June 17, 2026 at 07:38 AM UTC
2 products affected across 1 vendorKyberCrystals Kyber

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
PoC

Description

The Kyber reference implementation before 9b8d306, when compiled by LLVM Clang through 18.x with some common optimization options, has a timing side channel that allows attackers to recover an ML-KEM 512 secret key in minutes. This occurs because poly_frommsg in poly.c does not prevent Clang from emitting a vulnerable secret-dependent branch.

Affected

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

v < 2024-06-03
Affected range stops below 2024-06-03, so it looks safe — our inference, not a vendor statement
v < 2024-06-03
Affected range stops below 2024-06-03, 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:

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

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

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-203

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