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CVE-2020-9839

34
FAUCET Score

CVE-2020-9839 is a race condition vulnerability affecting Apple's iOS, iPadOS, macOS, tvOS, and watchOS that could allow an application to gain elevated privileges. With a CVSS score of 7.0 (HIGH), this vulnerability has a high attack complexity and requires user interaction, but could lead to significant impact on confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog, a Metasploit module exists for local privilege escalation on macOS, indicating exploitability. Despite this, there is no evidence of active exploitation, and community discussion and media coverage are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 13.5CPE matchmatch criteria
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
< 13.5CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
< 10.15.5CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
< 13.4.5CPE matchmatch criteria
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
< 6.2.5CPE matchmatch criteria
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.0HIGH

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.0
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.67%
Probability of exploitation in next 30 days
EPSS Percentile
88.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Metasploit: macOS cfprefsd Arbitrary File Write Local Privilege Escalation · Mar 18, 2020
This CVE's current EPSS score of 0.0367 is in the 95th percentile among its peer group of 386 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.0 Bluesky, 0.1 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

applevendor investigatingvia nvd_reference
View patch

References

support.apple.com / HT211168
Vendor Advisory
support.apple.com / HT211170
Vendor Advisory
support.apple.com / HT211171
Vendor Advisory
support.apple.com / HT211175
Vendor Advisory