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CVE-2021-4166 high CVSS 7.1

Out-of-Bounds Read in Apple macOS (CVE-2021-4166)

Summary

Vulnerability in Apple macOS (CVE-2021-4166). Confidential information can be exposed externally.

Original description

The description as published by the source.

vim is vulnerable to Out-of-bounds Read

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A weakness called CVE-2021-4166 was discovered in Apple macOS.
Severity is High (CVSS 7.1/10). If exploited, attackers can leak data or disrupt key functionality.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Apple macOS CVE-2021-4166".

CVE-2021-4166 (Apple macOS). Severity: High / CVSSv3 7.1. Category: CWE-125.
Response plan:

  1. Check the vendor advisory for affected versions and the patched release.
  2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
  3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
  4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
    PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem

A weakness (CVE-2021-4166) in Apple macOS. A serious software flaw has been identified.

📍 Affected scope

Target versions of Apple macOS (see vendor advisory). If running in production, identify exposure immediately.

🔥 Severity

Severity: High (CVSS 7.1/10). If exploited, attackers can leak data or disrupt key functionality.

🔧 How to fix

Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-125)

🛡️ Workaround

If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.

🔍 Detection

Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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