CVE-2021-40401

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.32% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 70.5% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/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

2022-02-04 00:00Z4 YR AGO

Last updated

2025-04-15 19:12Z1 YR AGO

Reserved

2021-09-01

Assigning CNA

talos

Record state

PUBLISHED

Severity

Critical (CVSS 10.0)

CNA CVSS vector

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

Weaknesses

• CWE-252Unchecked Return ValueBase

Data version

5.1

Document digest

49c42b9ac4fa4bafce0b18ac621361f699b95ce5f9a8c8f9983fa409389157ca

• talosintelligence.comhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1415
• lists.fedoraproject.orgFEDORA-2022-4a3ef86baahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TUM5GIUZJ7AVHVCXDZW6ZVCAPV2ISN47/vendor-advisory
• www.debian.orgDSA-5306https://www.debian.org/security/2022/dsa-5306vendor-advisory