CVE-2021-3731

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

1.24% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 67.0% of scored records. A rank, not a probability.

NVD base score

4.7 (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:C/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

2021-08-23 12:42Z5 YR AGO

Last updated

2024-08-03 17:01Z2 YR AGO

Reserved

2021-08-21

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

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

Weaknesses

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

Data version

5.1

Document digest

d168f3303897414d70069d103461f095f6e81424852d69e77d7eae56ba212180

• huntr.devhttps://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888ax_refsource_CONFIRM
• ledgersmb.orghttps://ledgersmb.org/cve-2021-3731-clickjackingx_refsource_CONFIRM
• www.debian.orgDSA-4962https://www.debian.org/security/2021/dsa-4962vendor-advisoryx_refsource_DEBIAN