CVE-2021-20291

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.59% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 73.4% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-04-01 17:49Z5 YR AGO

Last updated

2024-08-03 17:37Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-667Improper LockingClass

Data version

5.1

Document digest

7550e7fdeba504c54836d0a62ca8bc76004fc0af6c3371e5af959e9ba92af6be

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1939485x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-ec00da7faahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5D7XL7FL24TWFMGQ3K2S72EOUSLZMKL/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-83b3740389https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNMB7O2UIXE34PGSCSOULGHPX5LIJBMM/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-a3703b9dc8https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WX24EITRXVHDM5M223BVTJA2ODF2FSHI/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-c56a213327https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPYOHNG2Q7DCAQZMGYLMENLKALGDLG3X/vendor-advisoryx_refsource_FEDORA
• unit42.paloaltonetworks.comhttps://unit42.paloaltonetworks.com/cve-2021-20291/x_refsource_MISC