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.

Published: 2021-12-08 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-4048 is rated Moderate Risk (56.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.36%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-4048

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-20 0.24% 0.36% +0.13%
2 2026-01-02 0.36% 0.24% -0.13%
3 2025-11-21 — 0.36% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-4048

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2021-4048

OS Trackers for CVE-2021-4048

vendor priority summary link
debian not yet assigned CVE-2021-4048 not yet assigned priority: Debian including 2 source packages (lapack, openblas), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 2. https://security-tracker.debian.org/tracker/CVE-2021-4048
redhat medium — https://access.redhat.com/security/cve/CVE-2021-4048
suse medium CVE-2021-4048 severity moderate: SUSE including 133 source package names (0.1.6-1.2:libblas3-3.5.0-4.6.1, 0.1.6-1.2:liblapack3-3.5.0-4.6.1, …), 230 product×package rows across 33 product lines (Container containers/lmcache-lmstack-router, Container containers/lmcache-vllm-openai, … (33 product lines)): Fixed 215, Known Not Affected 15. https://www.suse.com/security/cve/CVE-2021-4048/
ubuntu low CVE-2021-4048 low priority: Ubuntu including 2 source packages (lapack, openblas), 30 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 17, ignored 5, needed 4, needs-triage 2, released 2. https://ubuntu.com/security/CVE-2021-4048

Affected software / configurations for CVE-2021-4048

Vendor Product Version Raw CPE
lapack_project lapack <= 3.10.0 cpe:2.3:a:lapack_project:lapack:*:*:*:*:*:*:*:*
openblas_project openblas < 0.3.18 cpe:2.3:a:openblas_project:openblas:*:*:*:*:*:*:*:*
julialang julia <= 1.6.3 cpe:2.3:a:julialang:julia:*:*:*:*:*:*:*:*
julialang julia 1.7.0 cpe:2.3:a:julialang:julia:1.7.0:beta1:*:*:*:*:*:*
julialang julia 1.7.0 cpe:2.3:a:julialang:julia:1.7.0:beta2:*:*:*:*:*:*
julialang julia 1.7.0 cpe:2.3:a:julialang:julia:1.7.0:beta3:*:*:*:*:*:*
julialang julia 1.7.0 cpe:2.3:a:julialang:julia:1.7.0:beta4:*:*:*:*:*:*
julialang julia 1.7.0 cpe:2.3:a:julialang:julia:1.7.0:rc1:*:*:*:*:*:*
redhat ceph_storage 2.0 cpe:2.3:a:redhat:ceph_storage:2.0:*:*:*:*:*:*:*
redhat ceph_storage 3.0 cpe:2.3:a:redhat:ceph_storage:3.0:*:*:*:*:*:*:*
redhat ceph_storage 4.0 cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:*
redhat ceph_storage 5.0 cpe:2.3:a:redhat:ceph_storage:5.0:*:*:*:*:*:*:*
redhat openshift_container_storage 4.0 cpe:2.3:a:redhat:openshift_container_storage:4.0:*:*:*:*:*:*:*
redhat openshift_data_foundation 4.0 cpe:2.3:a:redhat:openshift_data_foundation:4.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

References for CVE-2021-4048

URL Tags
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/
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