CVE-2021-30983

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

7.8

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 15.2 and iPadOS 15.2. An application may be able to execute arbitrary code with kernel privileges.

CVSS v3: 7.8
EG Score: 9.0(high)
EPSS: 66.3%
KEV: ⚠ Exploited

Published

August 24, 2021

Last Modified

October 23, 2025

Advisory Details (2)

Auto-updated Jun 4, 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-2021-30983

generic

About the security content of iOS 15.2 and iPadOS 15.2 - Apple Support

https://support.apple.com/en-us/HT212976

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 20× in last 7d / 20× 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.

2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 05:37 UTCEG score recompute
2026-06-05 01:23 UTCEG score recompute
2026-06-04 21:08 UTCEG score recompute
2026-06-04 16:54 UTCEG score recompute
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 12:40 UTCEG score recompute
2026-06-04 08:26 UTCEG score recompute
2026-06-04 04:12 UTCEG score recompute
2026-06-03 23:58 UTCEG score recompute
2026-06-03 19:44 UTCEG score recompute
2026-06-03 19:09 UTCkev_newly_listed
2026-06-03 15:30 UTCEG score recompute
2026-06-03 11:15 UTCEG score recompute
2026-06-03 07:01 UTCEG score recompute
2026-06-03 02:47 UTCEG score recompute
2026-06-02 22:33 UTCEG score recompute
2026-06-02 20:11 UTCepss_batch

Frequently asked(6)

What is CVE-2021-30983?

CVE-2021-30983 is a high vulnerability published on August 24, 2021. A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 15.2 and iPadOS 15.2. An application may be able to execute arbitrary code with kernel privileges.

When was CVE-2021-30983 disclosed?

CVE-2021-30983 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-2021-30983 actively exploited?

Yes. CISA added CVE-2021-30983 to the Known Exploited Vulnerabilities catalog on June 27, 2022, affecting Apple iOS and iPadOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2021-30983?

CVE-2021-30983 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-2021-30983?

CVE-2021-30983 affects Apple iOS and iPadOS. 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-2021-30983?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30983, 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-2021-30983

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CVE-2021-30983

📅 Published

🔄 Last Modified

📋 Advisory Details (2)