CVE-2021-30657

Name: CVE-2021-30657
Creator: NVD / NIST
Published: 2021-09-08T15:15:13.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10Actively ExploitedEPSS 68.53%

Last modified Jun 17, 2026

CVE-2021-30657 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. CISA has confirmed active exploitation in the wild. EPSS estimates a 68.53% chance of exploitation in the next 30 days.

Description

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..

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

68.53%

99.2th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Nov 17, 2021.

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Apple	Mac Os X	>= 10.15, <= 10.15.5
Apple	Mac Os X	10.15.6
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.3

References

https://support.apple.com/en-us/HT212325Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212326Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212325Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212326Release Notes, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30657Third Party Advisory, US Government Resource

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-30657?

How severe is CVE-2021-30657?

CVE-2021-30657 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 68.53% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-30657?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30657?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST