CVE-2020-27950

Exp

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.

Published: 2020-12-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-27950 is rated Active Exploitation (75.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 16.52%, 97th percentile). CISA KEV confirms active exploitation (added 2021-11-03) affecting Apple / Multiple Products. a weakness (CWE-665) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2020-27950

Name: Apple Multiple Products Memory Initialization Vulnerability · CISA KEV detail

Exploit added: 2021-11-03

Action due: 2022-05-03

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2020-27950

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 43.76% 16.52% -27.24%
2 2026-05-08 44.35% 43.76% -0.59%
3 2026-05-01 — 44.35% —

Full EPSS history (41 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27950

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [email protected]
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.1 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 6.9 [email protected]

Weakness enumeration for CVE-2020-27950

Affected software / configurations for CVE-2020-27950

Vendor Product Version Raw CPE
apple ipados < 14.2 cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple iphone_os < 12.4.9 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple iphone_os >= 14.0, < 14.2 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple macos < 10.15.7 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
apple macos >= 11.0, < 11.0.1 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
apple watchos < 5.3.9 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
apple watchos >= 6.0, < 6.2.9 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
apple watchos >= 7.0, < 7.1 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

References for CVE-2020-27950

cvelogic Threat Intelligence