Is CVE-2021-4048 being actively exploited?

CVE-2021-4048 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2021-4048?

CVE-2021-4048 has a CVSS 3.1 base score of 9.1 (CRITICAL).

CVE-2021-4048

CRITICAL · CVSS 9.1EPSS 2.8%EU EUVD

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.

Key facts

CVSS score: 9.1 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): CWE-125
EPSS score: 2.8% (86th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2021-33945)
Published: December 8, 2021
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2021-33945 in the EU Vulnerability Database. Last updated in EUVD on August 3, 2024.

View on the EU Vulnerability Database

Affected products

fedoraproject / fedora
fedoraproject / fedora
julialang / julia
julialang / julia
julialang / julia
julialang / julia
julialang / julia
julialang / julia
lapack project / lapack
openblas project / openblas
redhat / ceph storage
redhat / ceph storage
redhat / ceph storage
redhat / ceph storage
redhat / enterprise linux
redhat / openshift container storage
redhat / openshift data foundation

Certified products that may be affected

23 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active
Red Hat Enterprise Linux 8 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 4642 - historical
Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat®, Inc. - FIPS 140 4458 - historical

See all 23 in the Security Certifications Explorer.

References

https://github.com/JuliaLang/julia/issues/42415(Issue Tracking, Patch, Third Party Advisory)
https://github.com/Reference-LAPACK/lapack/commit/38f3eeee3108b18158409ca2a100e6fe03754781(Patch, Third Party Advisory)
https://github.com/Reference-LAPACK/lapack/pull/625(Issue Tracking, Patch, Third Party Advisory)
https://github.com/xianyi/OpenBLAS/commit/2be5ee3cca97a597f2ee2118808a2d5eacea050c(Patch, Third Party Advisory)
https://github.com/xianyi/OpenBLAS/commit/337b65133df174796794871b3988cd03426e6d41(Patch, Third Party Advisory)
https://github.com/xianyi/OpenBLAS/commit/ddb0ff5353637bb5f5ad060c9620e334c143e3d7(Patch, Third Party Advisory)
https://github.com/xianyi/OpenBLAS/commit/fe497efa0510466fd93578aaf9da1ad8ed4edbe7(Patch, Third Party Advisory)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QFEVOCUG2UXMVMFMTU4ONJVDEHY2LW2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DROZM4M2QRKSD6FBO4BHSV2QMIRJQPHT/

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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