CVE-2021-30900

HIGHNVD 7.89.0▲Trending — 3 sources updated this weekExploited in the wild

7.8

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.

CVSS v3: 7.8
EG Score: 9.0(high)
EPSS: 65.5%
KEV: ⚠ Exploited

Published

August 24, 2021

Last Modified

October 23, 2025

Advisory Details (4)

Auto-updated Jun 3, 2026

⚠️ Active exploitation confirmed. Patch available. Sources: cisa.

cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

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

generic🔴 Active Exploitation

About the security content of macOS Big Sur 11.6.1 - Apple Support

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

generic🔴 Active Exploitation

About the security content of iOS 14.8.1 and iPadOS 14.8.1 - Apple Support

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

generic

About the security content of iOS 15.1 and iPadOS 15.1 - Apple Support

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-10 07:24 UTCEG score recompute
2026-06-10 03:34 UTCEG score recompute
2026-06-09 23:45 UTCEG score recompute
2026-06-09 19:56 UTCEG score recompute
2026-06-09 18:42 UTCCISA KEV update
2026-06-09 17:12 UTCCISA KEV update
2026-06-09 16:08 UTCEG score recompute
2026-06-09 12:19 UTCEG score recompute
2026-06-09 08:30 UTCEG score recompute
2026-06-09 04:41 UTCEG score recompute
2026-06-09 00:52 UTCEG score recompute
2026-06-08 21:03 UTCEG score recompute
2026-06-08 19:16 UTCCISA KEV update
2026-06-08 17:26 UTCCISA KEV update
2026-06-08 17:14 UTCEG score recompute
2026-06-08 14:15 UTCEPSS rescore
2026-06-08 11:25 UTCEG score recompute
2026-06-08 07:36 UTCEG score recompute
2026-06-08 03:48 UTCEG score recompute
2026-06-07 23:59 UTCEG score recompute

Frequently asked(6)

What is CVE-2021-30900?

CVE-2021-30900 is a high vulnerability published on August 24, 2021. 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.

When was CVE-2021-30900 disclosed?

CVE-2021-30900 was first published in the National Vulnerability Database on August 24, 2021, with the most recent update on October 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-30900 actively exploited?

Yes. CISA added CVE-2021-30900 to the Known Exploited Vulnerabilities catalog on March 30, 2023, affecting Apple iOS, iPadOS, and macOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

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

CVE-2021-30900 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2021-30900?

CVE-2021-30900 affects Apple iOS, iPadOS, and macOS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-30900?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30900, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-30900

Explore →

Is Your Infrastructure Affected by CVE-2021-30900?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2021-30900

📅 Published

🔄 Last Modified

📋 Advisory Details (4)