CVE-2021-1879

MediumCVSS 6.1/10Known exploited (CISA KEV)Last modified Jun 17, 2026

Description

This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. Apple is aware of a report that this issue may have been actively exploited..

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
Apple	iOS and iPadOS	>= unspecified, < 14.4
Apple	iOS	>= unspecified, < 12.5
Apple	watchOS	>= unspecified, < 7.3

References

https://support.apple.com/en-us/HT212256Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212257Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212258Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212256Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212257Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212258Release Notes, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879US Government Resource

Timeline

Published: Apr 2, 2021
Last modified: Jun 17, 2026
Added to CISA KEV: Nov 3, 2021
NVD status: Analyzed

Related CVEs from 2021

CVE-2021-18807.8This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.3, watchOS 7.4. Processing a maliciously crafted imag CVE-2021-18817.8An out-of-bounds read was addressed with improved input validation. This issue is fixed in Security Update 2021-002 Catalina, Security Updat CVE-2021-18829.8A memory corruption issue was addressed with improved validation. This issue is fixed in Security Update 2021-002 Catalina, iOS 14.5 and iPa CVE-2021-18835.5This issue was addressed with improved checks. This issue is fixed in Security Update 2021-004 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4 CVE-2021-18845.9A race condition was addressed with improved locking. This issue is fixed in Security Update 2021-004 Mojave, iOS 14.5 and iPadOS 14.5, watc CVE-2021-18857.8An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watc CVE-2021-18867.8Incorrect handling of pointers in trusted application key import mechanism could cause memory corruption in Snapdragon Auto, Snapdragon Comp CVE-2021-18877.5An assertion can be reached in the WLAN subsystem while using the Wi-Fi Fine Timing Measurement protocol in Snapdragon Wired Infrastructure CVE-2021-18887.8Memory corruption in key parsing and import function due to double freeing the same heap allocation in Snapdragon Auto, Snapdragon Compute, CVE-2021-18897.8Possible buffer overflow due to lack of length check in Trusted Application in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity,CVE-2021-18907.8Improper length check of public exponent in RSA import key function could cause memory corruption. in Snapdragon Auto, Snapdragon Compute, S CVE-2021-18917.8A possible use-after-free occurrence in audio driver can happen when pointers are not properly handled in Snapdragon Auto, Snapdragon Comput