Is CVE-2021-30900 in the CISA KEV catalog?

Yes. CVE-2021-30900 is on the CISA Known Exploited Vulnerabilities list, added 2023-03-30.

What is the CVSS severity of CVE-2021-30900?

CVE-2021-30900 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-30900?

CVE-2021-30900 has an EPSS score of 5.20% (91th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-30900

HIGHCISA KEVEPSS 91th pctl

7.8

CVSS v3

NVD

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

CWE-787Out-of-bounds Write

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.20%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

Apple GPU drivers, included in iOS, iPadOS, and macOS, contain an out-of-bounds write vulnerability that may allow a malicious application to execute code with kernel privileges.

Apply updates per vendor instructions.

Remediation due: 2023-04-20

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-23.