CVE-2021-4048

Name: CVE-2021-4048
Creator: NVD / NIST
Published: 2021-12-08T22:15:10.22+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 2.62%

Last modified Jun 17, 2026

CVE-2021-4048 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 2.62% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

2.62%

83.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions	Update
Lapack Project	Lapack	<= 3.10.0	—
Openblas Project	Openblas	< 0.3.18	—
Julialang	Julia	<= 1.6.3	—
Julialang	Julia	1.7.0	Beta1
Redhat	Ceph Storage	2.0	—
Redhat	Ceph Storage	3.0	—
Redhat	Ceph Storage	4.0	—
Redhat	Ceph Storage	5.0	—
Redhat	Openshift Container Storage	4.0	—
Redhat	Openshift Data Foundation	4.0	—
Redhat	Enterprise Linux	8.0	—
Fedoraproject	Fedora	34	—
Fedoraproject	Fedora	35	—

References

https://github.com/JuliaLang/julia/issues/42415Issue Tracking, Patch, Third Party Advisory
https://github.com/Reference-LAPACK/lapack/commit/38f3eeee3108b18158409ca2a100e6fe03754781Patch, Third Party Advisory
https://github.com/Reference-LAPACK/lapack/pull/625Issue Tracking, Patch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/2be5ee3cca97a597f2ee2118808a2d5eacea050cPatch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/337b65133df174796794871b3988cd03426e6d41Patch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/ddb0ff5353637bb5f5ad060c9620e334c143e3d7Patch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/fe497efa0510466fd93578aaf9da1ad8ed4edbe7Patch, 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/
https://github.com/JuliaLang/julia/issues/42415Issue Tracking, Patch, Third Party Advisory
https://github.com/Reference-LAPACK/lapack/commit/38f3eeee3108b18158409ca2a100e6fe03754781Patch, Third Party Advisory
https://github.com/Reference-LAPACK/lapack/pull/625Issue Tracking, Patch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/2be5ee3cca97a597f2ee2118808a2d5eacea050cPatch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/337b65133df174796794871b3988cd03426e6d41Patch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/ddb0ff5353637bb5f5ad060c9620e334c143e3d7Patch, Third Party Advisory
https://github.com/xianyi/OpenBLAS/commit/fe497efa0510466fd93578aaf9da1ad8ed4edbe7Patch, 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/

Timeline

Published: Dec 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4048?

How severe is CVE-2021-4048?

CVE-2021-4048 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 2.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4048?

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-2021-4048?

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

Scan your code now

Source: NVD / NIST