CVE-2021-30900

HIGH

7.8

CVSS Score

Published: August 24, 2021 at 06:50 PM UTC

Updated: June 17, 2026 at 03:51 AM UTC

3 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity

HIGH7.8

Exploitation

CISA KEV

Exploit prediction

EPSS 5%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score5.2%

EPSS (Exploit Prediction Scoring System) estimates a 5.2% chance this CVE is exploited in the wild within the next 30 days — higher than 92% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Unknown

Added to KEV

Mar 30, 2023

Remediation Due

Apr 20, 2023

1291 days overdue

Notes

https://support.apple.com/en-us/HT21286, https://support.apple.com/en-us/HT212868, https://support.apple.com/kb/HT212872

https://nvd.nist.gov/vuln/detail/CVE-2021-30900

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iPadOS · Apple

95%

v < 14.8v < 14.8.1v < 15.115.0

Affected range stops below 14.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.8.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

iPhone OS · Apple

95%

v < 14.8.115.0

Affected range stops below 14.8.1, so it looks safe — our inference, not a vendor statement

macOS · Apple

95%

v < 11.6.1

Affected range stops below 11.6.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212867

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212868

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://support.apple.com/kb/HT212872

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30900

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-787

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