CVE-2020-27950

MEDIUM

5.5

CVSS Score

Published: December 8, 2020 at 08:17 PM UTC

Updated: June 17, 2026 at 03:09 AM UTC

4 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity

MEDIUM5.5

Exploitation

CISA KEV

Exploit prediction

EPSS 17%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score16.5%

EPSS (Exploit Prediction Scoring System) estimates a 16.5% chance this CVE is exploited in the wild within the next 30 days — higher than 97% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Apple iOS, iPadOS, macOS, and watchOS contain a memory initialization vulnerability that may allow a malicious application to disclose kernel memory.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Unknown

Added to KEV

Nov 3, 2021

Remediation Due

May 3, 2022

1641 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2020-27950

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iPadOS · Apple

95%

v < 14.2

Affected range stops below 14.2, so it looks safe — our inference, not a vendor statement

iPhone OS · Apple

95%

v < 12.4.914.0 ≤ v < 14.2

Affected range stops below 12.4.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.2, so it looks safe — our inference, not a vendor statement

macOS · Apple

95%

v < 10.15v < 10.15.7v < 11.0v < 12.4v < 2020v < 5.3v < 6.211.0 ≤ v < 11.0.1

Affected range stops below 10.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.15.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 12.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 2020, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2, so it looks safe — our inference, not a vendor statement

watchOS · Apple

95%

v < 5.3.9v < 7.16.0 ≤ v < 6.2.97.0 ≤ v < 7.1

Affected range stops below 5.3.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (11)

x_refsource_MISCThird Party AdvisoryVDB Entry

Source: [email protected]

http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html

Mailing Listx_refsource_FULLDISCThird Party Advisory

Source: [email protected]

http://seclists.org/fulldisclosure/2020/Dec/32