CVE-2021-21135

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

19.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.1% of scored records. A rank, not a probability.

NVD base score

6.5 (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:H/I:N/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

2021-02-09 13:56Z5 YR AGO

Last updated

2024-08-03 18:01Z2 YR AGO

Reserved

2020-12-21

Assigning CNA

Chrome

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-346Origin Validation ErrorClass

Data version

5.1

Document digest

f3c4f5ff4bab31d85dd91b6dac4a615e07d69729a74f0e794c3d8d385404c51a

• chromereleases.googleblog.comhttps://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.htmlx_refsource_MISC
• crbug.comhttps://crbug.com/1157818x_refsource_MISC
• msrc.microsoft.comhttps://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21135x_refsource_MISC