CVE-2021-30736

HIGHNVD 7.87.8—Trending — 3 sources updated this week

7.8

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Big Sur 11.4, tvOS 14.6, watchOS 7.5, iOS 14.6 and iPadOS 14.6. An application may be able to execute arbitrary code with kernel privileges.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 59.8%
KEV: Not listed

Published

September 8, 2021

Last Modified

November 21, 2024

References (8)

product-security@applehttps://support.apple.com/en-us/HT212528
product-security@applehttps://support.apple.com/en-us/HT212529
product-security@applehttps://support.apple.com/en-us/HT212532
product-security@applehttps://support.apple.com/en-us/HT212533
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212528
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212529
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212532
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212533

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 10:55 UTCEG score recompute
2026-05-26 10:55 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-30736?

CVE-2021-30736 is a high vulnerability published on September 8, 2021. A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Big Sur 11.4, tvOS 14.6, watchOS 7.5, iOS 14.6 and iPadOS 14.6. An application may be able to execute arbitrary code with kernel privileges.

When was CVE-2021-30736 disclosed?

CVE-2021-30736 was first published in the National Vulnerability Database on September 8, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-30736 actively exploited?

CVE-2021-30736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30736?

CVE-2021-30736 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2021-30736?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30736, 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-2021-30736

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Is Your Infrastructure Affected by CVE-2021-30736?

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CVE-2021-30736

📅 Published

🔄 Last Modified

🔗 References (8)