CVE-2024-37880

Name: CVE-2024-37880
Creator: NVD / NIST
Published: 2024-06-10T02:15:47.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2024-37880 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.70%

48.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Pq-Crystals	Kyber	< 2024-06-03

References

https://github.com/antoonpurnal/clangoverExploit
https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6cPatch
https://news.ycombinator.com/item?id=40577486Not Applicable
https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/Exploit, Third Party Advisory
https://twitter.com/purnaltoon/status/1797644696568959476Exploit
https://github.com/antoonpurnal/clangoverExploit
https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6cPatch
https://news.ycombinator.com/item?id=40577486Not Applicable
https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/Exploit, Third Party Advisory
https://twitter.com/purnaltoon/status/1797644696568959476Exploit

Timeline

Published: Jun 10, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-37880?

How severe is CVE-2024-37880?

CVE-2024-37880 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2024-37880?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-37880?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST