Is CVE-2021-30657 actively exploited?

Yes. KEV Intelligence tracks CVE-2021-30657 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-2021-30657. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2021-30657 affects Apple macOS. Reported affected versions include unspecified to < 11.3 and unspecified to < 2021.

Yes. CVE-2021-30657 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2021-30657

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-2021-30657 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

macOS

Apple / macOS · affected before 11.3

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Severity: CVSS 5.5 · Medium
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 68.5%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-30657 is an unauthenticated vulnerability affecting Apple macOS. A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A...

Is it exploited?

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

Who is affected?

Apple / macOS affected before 11.3.

What should we do?

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

Overview

A logic issue was addressed with improved state management

A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina.

A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..

Vendor Product Affected Status

Apple macOS Before 11.3 Affected

Apple macOS Before 2021 Affected

Published: 08 Sep 2021
Exploitation Reported: 03 Nov 2021
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-2021-30657
support.apple.com/en-us/HT212325 support.apple.com · CVE Record https://support.apple.com/en-us/HT212325
support.apple.com/en-us/HT212326 support.apple.com · CVE Record https://support.apple.com/en-us/HT212326

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 03 Nov 2021

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	2021-11-03 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

Metasploit template detected 28 Apr 2025.

View Metasploit template

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
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/osx/browser/osx_gatekeeper_bypass.rb	28 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

5.5 Medium

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

EPSS

68.5%

Weaknesses

Missing Authorization CWE-862

All CVSS Scores

CVSS v3.1 5.5 Medium

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

CVSS v2.0 4.3 Medium

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

Timeline

From disclosure to observed exploitation

28 Apr 2025
Metasploit module available

Exploit module available
03 Nov 2021
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
08 Sep 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-2021-30657

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2021-30657",
  "confidence": "Confirmed",
  "cvss_score": 5.5,
  "cvss_estimated": false,
  "epss_score": 0.68531,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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