CVE-2020-3856

Name: CVE-2020-3856
Creator: NVD / NIST
Published: 2020-02-27T21:15:17.49+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.92%

Last modified Jun 17, 2026

CVE-2020-3856 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. EPSS estimates a 0.92% chance of exploitation in the next 30 days.

Description

A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. Processing a maliciously crafted string may lead to heap corruption.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.92%

55.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 13.3.1
Apple	Iphone Os	< 13.3.1
Apple	Mac Os X	< 10.15.3
Apple	Tvos	< 13.3.1
Apple	Watchos	< 6.1.2

References

https://support.apple.com/HT210918Release Notes, Vendor Advisory
https://support.apple.com/HT210919Release Notes, Vendor Advisory
https://support.apple.com/HT210920Release Notes, Vendor Advisory
https://support.apple.com/HT210921Release Notes, Vendor Advisory
https://support.apple.com/HT210918Release Notes, Vendor Advisory
https://support.apple.com/HT210919Release Notes, Vendor Advisory
https://support.apple.com/HT210920Release Notes, Vendor Advisory
https://support.apple.com/HT210921Release Notes, Vendor Advisory

Timeline

Published: Feb 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3856?

How severe is CVE-2020-3856?

CVE-2020-3856 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3856?

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-2020-3856?

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

Scan your code now

Source: NVD / NIST