CVE-2021-30657

Status: AnalyzedMedium (5.5)⚠ Active exploitation💥 Exploit

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..

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Base score: 5.5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 69%
Percentile among all scored CVEs: 99
Score date: 10/7/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Added to catalog: 11/3/2021
Remediation due date: 11/17/2021
Known ransomware use: Unknown

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Metasploit module (reliable, widely available exploit) · macOS Gatekeeper check bypass
Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1203 Exploitation for Client Executionexecution85 %
Secondary impactT1204.002 Malicious Fileexecution75 %

Explotación corregida por reglas (vector CVSS): era T1068

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

User Training Execution Prevention Behavior Prevention on Endpoint Application Isolation and Sandboxing Exploit Protection Update Software

Affected technologies (2)

Apple — MAC OS X Apple — Macos

CWEs

NVD-CWE-noinfo
CWE-862

References

Raw JSON (NVD)

Show

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