CVE-2021-33907

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

2.96% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 86.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI: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

2021-09-27 13:55Z4 YR AGO

Last updated

2024-08-04 00:05Z2 YR AGO

Reserved

2021-06-07

Assigning CNA

Zoom

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-295Improper Certificate ValidationBase

Data version

5.1

Document digest

8761f94f8c47ef734e13f39a4c2063105793c744467b84e26ae16bd3f91c69dc

• explore.zoom.ushttps://explore.zoom.us/en/trust/security/security-bulletin/x_refsource_MISC