CVE-2021-21155

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

1.32% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 70.5% of scored records. A rank, not a probability.

NVD base score

9.6 (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: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

2021-02-22 21:20Z5 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-787Out-of-bounds WriteBase

Data version

5.1

Document digest

c9dff065d503daea808c09d42dbcac2d6fa467ed8be4692480d1899eb916f2f8

• chromereleases.googleblog.comhttps://chromereleases.googleblog.com/2021/02/stable-channel-update-for-desktop_16.htmlx_refsource_MISC
• crbug.comhttps://crbug.com/1175500x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-aa764a8531https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BI6ZIJQYP5DFMYVX4J5OGOU2NQLEZ3SB/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-c88a96bd4bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/vendor-advisoryx_refsource_FEDORA
• security.gentoo.orgGLSA-202104-08https://security.gentoo.org/glsa/202104-08vendor-advisoryx_refsource_GENTOO