CVE-2020-9859

Name: CVE-2020-9859
Creator: NVD / NIST
Published: 2020-06-05T15:15:11.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 0.80%

Last modified Jun 17, 2026

CVE-2020-9859 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5.1 and iPadOS 13.5.1, macOS Catalina 10.15.5 Supplemental Update, tvOS 13.4.6, watchOS 6.2.6. CISA has confirmed active exploitation in the wild. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5.1 and iPadOS 13.5.1, macOS Catalina 10.15.5 Supplemental Update, tvOS 13.4.6, watchOS 6.2.6. An application may be able to execute arbitrary code with kernel privileges.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.80%

51.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 13.5.1
Apple	Iphone Os	< 13.5.1
Apple	Mac Os X	< 10.15.5
Apple	Tvos	< 13.4.6
Apple	Watchos	< 6.2.6

References

https://support.apple.com/HT211214Release Notes, Vendor Advisory
https://support.apple.com/HT211214Release Notes, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9859US Government Resource

Timeline

Published: Jun 5, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2020-9859?

How severe is CVE-2020-9859?

CVE-2020-9859 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-9859?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-9859?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST