CVE-2021-30851

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

2.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 82.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-08-24 18:49Z5 YR AGO

Last updated

2024-08-03 22:48Z2 YR AGO

Reserved

2021-04-13

Assigning CNA

apple

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

14d1a8a4d696613b2966775a718fe8e4e6b869d20fe5b53f48743df61652cf23

• support.apple.comhttps://support.apple.com/en-us/HT212814x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212819x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212815x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212816x_refsource_MISC
• support.apple.comhttps://support.apple.com/kb/HT212869x_refsource_CONFIRM
• www.debian.orgDSA-4995https://www.debian.org/security/2021/dsa-4995vendor-advisoryx_refsource_DEBIAN
• www.debian.orgDSA-4996https://www.debian.org/security/2021/dsa-4996vendor-advisoryx_refsource_DEBIAN
• www.openwall.com[oss-security] 20211031 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006http://www.openwall.com/lists/oss-security/2021/10/31/1mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2021-131360fa9ahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ON5SDVVPVPCAGFPW2GHYATZVZYLPW2L4/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-483d896d1dhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H6MGXCX7P5AHWOQ6IRT477UKT7IS4DAD/vendor-advisoryx_refsource_FEDORA