high
7.8
CWE
20 125
Advisory Published
CVE Published
Updated

CVE-2021-1881: Input Validation

First published: Mon Apr 26 2021(Updated: )

An out-of-bounds read was addressed with improved input validation. This issue is fixed in Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing a maliciously crafted font file may lead to arbitrary code execution.

Credit: an anonymous researcher Xingwei Lin Ant Security LightMickey Jin Trend Micro Hou JingYi @hjy79425575 Qihoo 360an anonymous researcher Xingwei Lin Ant Security LightMickey Jin Trend Micro Hou JingYi @hjy79425575 Qihoo 360an anonymous researcher Ant Security LightXingwei Lin Ant Security LightMickey Jin Trend Micro Qihoo 360Hou JingYi @hjy79425575 Qihoo 360an anonymous researcher Xingwei Lin Ant Security LightMickey Jin Trend Micro Hou JingYi @hjy79425575 Qihoo 360Hou JingYi @hjy79425575 Qihoo 360an anonymous researcher Xingwei Lin Ant Security Light Mickey Jin Trend MicroHou JingYi @hjy79425575 Qihoo 360an anonymous researcher Xingwei Lin Ant Security Light Mickey Jin Trend Micro product-security@apple.com

Affected SoftwareAffected VersionHow to fix
Apple iOS<14.5
14.5
Apple iPadOS<14.5
14.5
Apple tvOS<14.5
14.5
<7.4
7.4
Apple macOS Big Sur<11.3
11.3
Apple Catalina
Apple Mojave
Apple iPadOS<14.5
Apple iPhone OS<14.5
Apple Mac OS X>=10.14<=10.14.5
Apple Mac OS X>=10.15<=10.15.5
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=10.14.6-supplemental_update
Apple Mac OS X=10.14.6-supplemental_update_2
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-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 Mac OS X=10.15.7-supplemental_update
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-2021-1881?

    CVE-2021-1881 is a vulnerability in Apple's FontParser that allows an attacker to read out-of-bounds memory due to inadequate input validation.

  • What is the severity of CVE-2021-1881?

    The severity of CVE-2021-1881 is not mentioned in the provided information.

  • Which software versions are affected by CVE-2021-1881?

    Affected software versions include Apple iOS up to version 14.5, Apple iPadOS up to version 14.5, Apple watchOS up to version 7.4, Apple macOS Big Sur up to version 11.3, Apple Catalina, Apple tvOS up to version 14.5, and Apple Mojave.

  • How can I fix CVE-2021-1881?

    To fix CVE-2021-1881, apply the recommended updates provided by Apple for the affected software versions.

  • Where can I find more information about CVE-2021-1881?

    You can find more information about CVE-2021-1881 on Apple's official support page with the reference links: [https://support.apple.com/en-us/HT212326](https://support.apple.com/en-us/HT212326), [https://support.apple.com/en-us/HT212327](https://support.apple.com/en-us/HT212327), and [https://support.apple.com/en-us/HT212317](https://support.apple.com/en-us/HT212317).

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