CVE-2021-21775

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

1.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 67.4% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

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

2021-07-07 21:18Z5 YR AGO

Last updated

2024-08-03 18:23Z2 YR AGO

Reserved

2021-01-04

Assigning CNA

talos

Record state

PUBLISHED

Severity

Medium (CVSS 6.8)

CNA CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.1

Document digest

6b48f5857301e3ebddadaace0ce61e7372e86e515a10c3c80190bc92089fe279

• talosintelligence.comhttps://talosintelligence.com/vulnerability_reports/TALOS-2021-1229x_refsource_MISC
• www.openwall.com[oss-security] 20210723 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0004http://www.openwall.com/lists/oss-security/2021/07/23/1mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2021-cf7d8c7b1ahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4QORERLPDN3UNNJFJSOMHZZCU2G75Q6/vendor-advisoryx_refsource_FEDORA
• www.debian.orgDSA-4945https://www.debian.org/security/2021/dsa-4945vendor-advisoryx_refsource_DEBIAN
• lists.fedoraproject.orgFEDORA-2021-3de956ceeehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KYMMBQN4PRVDLMIJT2LY2BWHLYBD57P3/vendor-advisoryx_refsource_FEDORA