medium
6.5
CWE
665
Advisory Published
CVE Published
Updated

CVE-2021-1857

First published: Thu Apr 22 2021(Updated: )

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.

Credit: an anonymous researcher an anonymous researcher an anonymous researcher an anonymous researcher an anonymous researcher an anonymous researcher an anonymous researcher an anonymous researcher product-security@apple.com

Affected SoftwareAffected VersionHow to fix
Apple iTunes for Windows<12.11.3
12.11.3
Apple Mojave
Apple iCloud for Windows<12.3
12.3
Apple Catalina
Apple macOS Big Sur<11.3
11.3
Apple tvOS<14.5
14.5
Apple watchOS<7.4
7.4
Apple iOS<14.5
14.5
Apple iPadOS<14.5
14.5
Apple Icloud Windows<12.3
Apple Itunes Windows<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=10.14.4-beta4
Apple Mac OS X=10.14.5
Apple Mac OS X=10.14.6
Apple Mac OS X=10.14.6
Apple Mac OS X=10.14.6-security_update_2019-001
Apple Mac OS X=10.14.6-security_update_2019-002
Apple Mac OS X=10.14.6-security_update_2019-004
Apple Mac OS X=10.14.6-security_update_2019-005
Apple Mac OS X=10.14.6-security_update_2019-006
Apple Mac OS X=10.14.6-security_update_2019-007
Apple Mac OS X=10.14.6-security_update_2020-001
Apple Mac OS X=10.14.6-security_update_2020-002
Apple Mac OS X=10.14.6-security_update_2020-003
Apple Mac OS X=10.14.6-security_update_2020-004
Apple Mac OS X=10.14.6-security_update_2020-005
Apple Mac OS X=10.14.6-security_update_2020-006
Apple Mac OS X=10.14.6-security_update_2020-007
Apple Mac OS X=10.14.6-security_update_2021-001
Apple Mac OS X=10.14.6-security_update_2021-002
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=10.15.6
Apple Mac OS X=10.15.6-supplemental_update
Apple Mac OS X=10.15.7
Apple Mac OS X=10.15.7
Apple Mac OS X=10.15.7-security_update_2020
Apple Mac OS X=10.15.7-security_update_2020-001
Apple Mac OS X=10.15.7-security_update_2020-005
Apple Mac OS X=10.15.7-security_update_2020-007
Apple Mac OS X=10.15.7-security_update_2021-001
Apple macOS>=11.0<11.3
Apple tvOS<14.5
Apple watchOS<7.4

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2021-1857?

    CVE-2021-1857 is a vulnerability related to CFNetwork in Apple iOS, iPadOS, watchOS, iCloud for Windows, iTunes for Windows, macOS Big Sur, Catalina, tvOS, and Mojave.

  • How does CVE-2021-1857 impact the affected software?

    CVE-2021-1857 addresses a memory initialization issue in CFNetwork with improved memory handling.

  • Which versions of Apple iOS, iPadOS, watchOS, iCloud for Windows, iTunes for Windows, macOS Big Sur, Catalina, tvOS, and Mojave are affected by CVE-2021-1857?

    CVE-2021-1857 affects up to and excluding version 14.5 of Apple iOS and iPadOS, up to and excluding version 7.4 of watchOS, version up to and excluding 12.3 of iCloud for Windows, up to and excluding version 12.11.3 of iTunes for Windows, up to and excluding version 11.3 of macOS Big Sur, up to and excluding version 14.5 of tvOS, and all versions of Catalina and Mojave.

  • How severe is CVE-2021-1857?

    The severity of CVE-2021-1857 is not specified in the information provided.

  • How can I fix CVE-2021-1857?

    To fix CVE-2021-1857, update your Apple iOS, iPadOS, watchOS, iCloud for Windows, iTunes for Windows, macOS Big Sur, Catalina, tvOS, or Mojave to the specified versions or later as recommended by Apple.

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