How severe is CVE-2021-30657?

CVE-2021-30657 has a CVSS score of 5.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-30657?

Affected package information for CVE-2021-30657 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-30657?

No fixed version has been published for CVE-2021-30657 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-30657 actively exploited in the wild?

Yes. There are 5 known exploit references for CVE-2021-30657, including 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-30657?

CVE-2021-30657 has an EPSS (Exploit Prediction Scoring System) score of 83.1%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2021-30657 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-30657 (Apple macOS Unspecified Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2021-11-17. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2021-30657?

CVE-2021-30657 is classified as CWE-862 (CWE-862). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2021-30657?

CVE-2021-30657 affects apple mac os x (2 versions, e.g. 10.15.6, 10.15.7); apple macos. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2021-30657 published, and has it been updated?

CVE-2021-30657 was published on September 8, 2021 and was last updated on October 23, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2021-11-17

CVE-2021-30657

MEDIUM

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…

Published

Sep 8, 2021

Updated

Oct 23, 2025

Affected

0 pkgs

Patched

None yet

Exploits

5 known

EPSS Exploitation Probability

via FIRST.org ↗

83.1%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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..

Affected Products

2 products · 10 configurations

mac os xapple

≥ 10.15 && ≤ 10.15.5

2 versions

10.15.610.15.7

macosapple

≥ 11.0 && < 11.3

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A logic issue was addressed with improved state management. This issue i…

github.comMetasploitAug 2021

A logic issue was addressed with improved state management. This issue i…

nvd.nist.govNVDSep 2021

A logic issue was addressed with improved state management. This issue i…

cisa.govCISANov 2021

A logic issue was addressed with improved state management. This issue i…

github.comGithubNov 2021

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-30657 in your stack?

O3 detects CVE-2021-30657 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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