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CVE-2021-1871: Apple iOS, iPadOS, and macOS

EPSS7.0%No. 1363 of 1739 in KEV
CVE year2021listed the same year
Same vendor in KEV95
Same product11
FieldValue
VendorApple
ProductiOS, iPadOS, and macOS
NameApple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability
Added to KEV2021-11-03
US federal due date2021-11-17
Ransomware useUnknown
CWECWE-1173

CISA description

Apple iOS, iPadOS, and macOS WebKit contain an unspecified logic vulnerability that allows a remote attacker to execute code. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Other entries for this product

CVEVendor / productAddedEPSSRansomware
CVE-2025-43300Apple iOS, iPadOS, and macOS2025-08-2132.4%Unknown
CVE-2023-41064Apple iOS, iPadOS, and macOS2023-09-1153.4%Unknown
CVE-2023-28206Apple iOS, iPadOS, and macOS2023-04-1023.2%Unknown
CVE-2021-30900Apple iOS, iPadOS, and macOS2023-03-305.2%Unknown
CVE-2022-32917Apple iOS, iPadOS, and macOS2022-09-145.6%Unknown
CVE-2020-9934Apple iOS, iPadOS, and macOS2022-09-083.2%Unknown
CVE-2022-22620Apple iOS, iPadOS, and macOS2022-02-1116.3%Unknown
CVE-2021-30869Apple iOS, iPadOS, and macOS2021-11-034.1%Unknown
CVE-2021-30858Apple iOS, iPadOS, and macOS2021-11-0313.3%Unknown
CVE-2021-1870Apple iOS, iPadOS, and macOS2021-11-037.7%Unknown

NVD — CVE-2021-1871

Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page

A Apple iOS, iPadOS, and macOS vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2021-11-03.