CVE-2021-21900

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

2.53% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 84.8% of scored records. A rank, not a probability.

NVD base score

8.8 (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:H/I:H/A:H

NVD analysis status

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

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2021-11-19 00:00Z4 YR AGO

Last updated

2024-08-03 18:30Z2 YR AGO

Reserved

2021-01-04

Assigning CNA

talos

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.1

Document digest

f311991eec8efbe73ccea83c0f4b421d68624354c3381eca7657fd50b31f2569

• talosintelligence.comhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1351
• lists.fedoraproject.orgFEDORA-2021-fa9e3c23f2https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-67c946a9f3https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/vendor-advisory
• lists.debian.org[debian-lts-announce] 20211203 [SECURITY] [DLA 2838-1] librecad security updatehttps://lists.debian.org/debian-lts-announce/2021/12/msg00002.htmlmailing-list
• www.debian.orgDSA-5077https://www.debian.org/security/2022/dsa-5077vendor-advisory
• security.gentoo.orgGLSA-202305-26https://security.gentoo.org/glsa/202305-26vendor-advisory