$ cve CVE-2021-1870 JSON

CVE-2021-1870 KEV

9.8

CRITICAL · CVSS 3.1 · EPSS 7.7% (pctl 94)

Patch first

On CISA KEV — known exploited in the wild, due 2021-11-17.

Description

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Scoring

CVSS	9.8 (CRITICAL, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS	7.71% — more likely to be exploited than 94% of all CVEs
On CISA KEV	yes — remediate by 2021-11-17
Public exploit	none known
Published	2021-04-02
Last modified	2026-06-17

CISA KEV

Name	Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability
Added	2021-11-03
Due	2021-11-17
Vendor / product	Apple / iOS, iPadOS, and macOS
Ransomware use	none reported

Affected (6)

Vendor	Product
apple	ipados
apple	iphone os
apple	mac os x
apple	macos
fedoraproject	fedora
webkitgtk	webkitgtk

References

→ the Explorer · watch your stack · NVD