Is CVE-2021-30900 actively exploited?

Yes. KEV Intelligence tracks CVE-2021-30900 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2021-30900. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2021-30900 affects Apple iOS and iPadOS. Reported affected versions include unspecified to < 15.1 and unspecified to < 14.8.

Yes. CVE-2021-30900 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2021-30900

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2021-30900 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

iOS and iPadOS

Apple / iOS and iPadOS · affected before 15.1

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Severity: CVSS 7.8 · High
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 5.2%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-30900 is an unauthenticated vulnerability affecting Apple iOS and iPadOS. 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...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Apple / iOS and iPadOS affected before 15.1.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

An out-of-bounds write issue was addressed with improved bounds checking

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.

Vendor Product Affected Status

Apple iOS and iPadOS Before 15.1 Affected

Apple iOS and iPadOS Before 14.8 Affected

Published: 24 Aug 2021
Exploitation Reported: 30 Mar 2023
Attack vector: Local
Complexity: Low
Privileges: None
User interaction: Required

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2021-30900
support.apple.com/kb/HT212872 support.apple.com · CVE Record https://support.apple.com/kb/HT212872
support.apple.com/en-us/HT212867 support.apple.com · CVE Record https://support.apple.com/en-us/HT212867
support.apple.com/en-us/HT212868 support.apple.com · CVE Record https://support.apple.com/en-us/HT212868

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 30 Mar 2023

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source	Added
CISA First	2023-03-30 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

Nessus template detected 02 Jun 2025.

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Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nessus	https://www.tenable.com/plugins/nessus/154722	02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High

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

EPSS

5.2%

Weaknesses

Out-of-bounds Write CWE-787

All CVSS Scores

CVSS v3.1 7.8 High

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

CVSS v2.0 9.3 High

AV:N/AC:M/Au:N/C:C/I:C/A:C

Timeline

From disclosure to observed exploitation

02 Jun 2025
Nessus plugin available

Scanner coverage available
30 Mar 2023
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
24 Aug 2021
CVE published

Vulnerability disclosed publicly
13 Apr 2021
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-30900

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2021-30900",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.05204,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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