How severe is CVE-2018-20543?

CVE-2018-20543 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-20543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20543?

CVE-2018-20543 affects Libxsmm Project Libxsmm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20543?

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

When was CVE-2018-20543 published?

CVE-2018-20543 was published on 2018-12-28 and last updated on 2026-06-17.

CVE-2018-20543

CVE-2018-20543 is a medium-severity vulnerability in Libxsmm Project Libxsmm with a CVSS 3.x base score of 6.5. 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-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Libxsmm Project Libxsmm
Published: 2018-12-28
Last modified: 2026-06-17

Description

There is an attempted excessive memory allocation at libxsmm_sparse_csc_reader in generator_spgemm_csc_reader.c in LIBXSMM 1.10 that will cause a denial of service.

Frequently asked questions

What is CVE-2018-20543?: There is an attempted excessive memory allocation at libxsmm_sparse_csc_reader in generator_spgemm_csc_reader.c in LIBXSMM 1.10 that will cause a denial of service.
How severe is CVE-2018-20543?: CVE-2018-20543 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-20543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20543?: CVE-2018-20543 affects Libxsmm Project Libxsmm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20543 published?: CVE-2018-20543 was published on 2018-12-28 and last updated on 2026-06-17.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1652634

Affected products (1)

cpe:2.3:a:libxsmm_project:libxsmm:1.10:*:*:*:*:*:*:*

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