# CVE-2020-27950: Apple Multiple Products Memory Initialization Vulnerability

> CVE-2020-27950: Apple Multiple Products Memory Initialization Vulnerability. CVSS 5.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-27950
Last updated: 2025-10-21T23:35:32Z

- Published: 2020-12-08 20:17 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: apple
- CVSS: 5.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS: 16.5%, 97th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown

## Description

A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apple: iOS and iPadOS
- Apple: macOS
- Apple: watchOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-27950)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-27950)
- [http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html](http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html)
- [http://seclists.org/fulldisclosure/2020/Dec/32](http://seclists.org/fulldisclosure/2020/Dec/32)
- [https://support.apple.com/en-us/HT211928](https://support.apple.com/en-us/HT211928)
- [https://support.apple.com/en-us/HT211929](https://support.apple.com/en-us/HT211929)
- [https://support.apple.com/en-us/HT211931](https://support.apple.com/en-us/HT211931)
- [https://support.apple.com/en-us/HT211940](https://support.apple.com/en-us/HT211940)
- [https://support.apple.com/en-us/HT211944](https://support.apple.com/en-us/HT211944)
- [https://support.apple.com/en-us/HT211945](https://support.apple.com/en-us/HT211945)
- [https://support.apple.com/en-us/HT211946](https://support.apple.com/en-us/HT211946)
- [https://support.apple.com/en-us/HT211947](https://support.apple.com/en-us/HT211947)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-27950 · Markdown: https://rewindex.com/cve/CVE-2020-27950.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-27950 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:42.095Z