CVE-2021-40834

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

0.75% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 54.4% of scored records. A rank, not a probability.

NVD base score

4.3 (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:L/A:N

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

2021-12-10 13:38Z4 YR AGO

Last updated

2024-08-04 02:51Z2 YR AGO

Reserved

2021-09-09

Assigning CNA

F-SecureUS

Record state

PUBLISHED

Severity

Medium (CVSS 4.3)

CNA CVSS vector

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

Weaknesses

• CWE-1021Improper Restriction of Rendered UI Layers or FramesBase

Data version

5.1

Document digest

bb88afca99f19cd8d9be8eea21ffc20901b2de46bd41130f317b7db49e854117

• www.f-secure.comhttps://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-famex_refsource_MISC
• www.f-secure.comhttps://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-40834x_refsource_MISC