How severe is CVE-2024-37880?

CVE-2024-37880 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2024-37880 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-37880?

CVE-2024-37880 affects Pq-crystals Kyber. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-37880?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-37880 have an EU (EUVD) identifier?

Yes. CVE-2024-37880 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-36864.

When was CVE-2024-37880 published?

CVE-2024-37880 was published on 2024-06-10 and last updated on 2026-06-17.

CVE-2024-37880

CVE-2024-37880 is a high-severity vulnerability in Pq-crystals Kyber with a CVSS 3.x base score of 7.5. 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-203.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-36864
Weakness: CWE-203
Affected product: Pq-crystals Kyber
Published: 2024-06-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-37880?: 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.
How severe is CVE-2024-37880?: CVE-2024-37880 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2024-37880 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-37880?: CVE-2024-37880 affects Pq-crystals Kyber. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-37880?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-37880 have an EU (EUVD) identifier?: Yes. CVE-2024-37880 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-36864.
When was CVE-2024-37880 published?: CVE-2024-37880 was published on 2024-06-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pq-crystals:kyber:*:*:*:*:*:*:*:*

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