CVE-2021-1857

Name: CVE-2021-1857
Creator: NVD / NIST
Published: 2021-09-08T15:15:11.453+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.19%

Last modified Jun 17, 2026

CVE-2021-1857 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A memory initialization issue was addressed with improved memory handling. This issue is fixed in iTunes 12.11.3 for Windows, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iCloud for Windows 12.3, macOS Big Sur 11.3, watchOS 7.4, tvOS 14.5, iOS 14.5 and iPadOS 14.5. EPSS estimates a 1.19% chance of exploitation in the next 30 days.

Description

A memory initialization issue was addressed with improved memory handling. This issue is fixed in iTunes 12.11.3 for Windows, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iCloud for Windows 12.3, macOS Big Sur 11.3, watchOS 7.4, tvOS 14.5, iOS 14.5 and iPadOS 14.5. Processing maliciously crafted web content may disclose sensitive user information.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.19%

63.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-665

Affected Software

Vendor	Product	Versions
Apple	Icloud	< 12.3
Apple	Itunes	< 12.11.3
Apple	Ipados	< 14.5
Apple	Iphone Os	< 14.5
Apple	Mac Os X	10.14
Apple	Mac Os X	10.14.0
Apple	Mac Os X	10.14.1
Apple	Mac Os X	10.14.2
Apple	Mac Os X	10.14.3
Apple	Mac Os X	10.14.4
Apple	Mac Os X	10.14.5
Apple	Mac Os X	10.14.6
Apple	Mac Os X	10.15
Apple	Mac Os X	10.15.1
Apple	Mac Os X	10.15.2
Apple	Mac Os X	10.15.3
Apple	Mac Os X	10.15.4
Apple	Mac Os X	10.15.5
Apple	Mac Os X	10.15.6
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.3
Apple	Tvos	< 14.5
Apple	Watchos	< 7.4

References

https://support.apple.com/en-us/HT212317Vendor Advisory
https://support.apple.com/en-us/HT212319Vendor Advisory
https://support.apple.com/en-us/HT212321Vendor Advisory
https://support.apple.com/en-us/HT212323Vendor Advisory
https://support.apple.com/en-us/HT212324Vendor Advisory
https://support.apple.com/en-us/HT212325Vendor Advisory
https://support.apple.com/en-us/HT212326Vendor Advisory
https://support.apple.com/en-us/HT212327Vendor Advisory
https://support.apple.com/en-us/HT212317Vendor Advisory
https://support.apple.com/en-us/HT212319Vendor Advisory
https://support.apple.com/en-us/HT212321Vendor Advisory
https://support.apple.com/en-us/HT212323Vendor Advisory
https://support.apple.com/en-us/HT212324Vendor Advisory
https://support.apple.com/en-us/HT212325Vendor Advisory
https://support.apple.com/en-us/HT212326Vendor Advisory
https://support.apple.com/en-us/HT212327Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1857?

How severe is CVE-2021-1857?

CVE-2021-1857 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1857?

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-2021-1857?

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

Scan your code now

Source: NVD / NIST