CVE-2021-40866

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

1.76% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 76.0% 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:A/AC:L/PR:N/UI:N/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

2021-09-13 07:16Z4 YR AGO

Last updated

2024-08-04 02:51Z2 YR AGO

Reserved

2021-09-13

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

No CWE assigned

Data version

5.1

Document digest

314c7ddc1940aa982c55930078a06df1cd5f21313bf5361b4f5f861919e152b7

• gynvael.coldwind.plhttps://gynvael.coldwind.pl/?id=740x_refsource_MISC
• kb.netgear.comhttps://kb.netgear.com/000063978/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Smart-Switches-PSV-2021-0140-PSV-2021-0144-PSV-2021-0145x_refsource_MISC