CVE-2021-1879

CVE-2021-1879 is a medium-severity (CVSS 6.1) vulnerability in Apple iOS, iPadOS, and watchOS. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA does not currently list it as used in ransomware campaigns. Apple has 96 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

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..

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

• https://support.apple.com/en-us/HT212256
• https://support.apple.com/en-us/HT212257
• https://support.apple.com/en-us/HT212258
• https://support.apple.com/en-us/HT212256
• https://support.apple.com/en-us/HT212257
• https://support.apple.com/en-us/HT212258
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879