How severe is CVE-2021-4048?

CVE-2021-4048 has a CVSS 3.x base score of 9.1, rated critical 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 high.

Is CVE-2021-4048 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4048?

CVE-2021-4048 primarily affects Redhat Ceph Storage. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-4048?

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

When was CVE-2021-4048 published?

CVE-2021-4048 was published on 2021-12-08 and last updated on 2026-06-17.

CVE-2021-4048

CVE-2021-4048 is a critical-severity vulnerability in Redhat Ceph Storage with a CVSS 3.x base score of 9.1. 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-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Redhat Ceph Storage
Published: 2021-12-08
Last modified: 2026-06-17

Description

An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose portions of its memory.

Frequently asked questions

What is CVE-2021-4048?: An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose portions of its memory.
How severe is CVE-2021-4048?: CVE-2021-4048 has a CVSS 3.x base score of 9.1, rated critical 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 high.
Is CVE-2021-4048 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4048?: CVE-2021-4048 primarily affects Redhat Ceph Storage. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-4048?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-4048 published?: CVE-2021-4048 was published on 2021-12-08 and last updated on 2026-06-17.

References

Affected products (17)

cpe:2.3:a:lapack_project:lapack:*:*:*:*:*:*:*:*
cpe:2.3:a:openblas_project:openblas:*:*:*:*:*:*:*:*
cpe:2.3:a:julialang:julia:*:*:*:*:*:*:*:*
cpe:2.3:a:julialang:julia:1.7.0:beta1:*:*:*:*:*:*
cpe:2.3:a:julialang:julia:1.7.0:beta2:*:*:*:*:*:*
cpe:2.3:a:julialang:julia:1.7.0:beta3:*:*:*:*:*:*
cpe:2.3:a:julialang:julia:1.7.0:beta4:*:*:*:*:*:*
cpe:2.3:a:julialang:julia:1.7.0:rc1:*:*:*:*:*:*
cpe:2.3:a:redhat:ceph_storage:2.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:ceph_storage:3.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:ceph_storage:5.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_storage:4.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_data_foundation:4.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

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