Is CVE-2021-30858 actively exploited?

Yes. CVE-2021-30858 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-30858 be exploited remotely?

The attack vector of CVE-2021-30858 has not been classified yet.

What is the CVSS score of CVE-2021-30858?

CVE-2021-30858 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-30858

HIGHCISA KEVIN THE WILD

CVE-2021-30858

Published: November 3, 2021

EPSS:0.79%probability of exploitation in 30 daysPercentile:73.7th

Official Description

Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. 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.

NVD Source

CISA KEV Advisory

Apple iOS, iPadOS, macOS Use-After-Free Vulnerability

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17

Required Action (CISA)

Apply updates per vendor instructions.

Technical Analysis

CVE-2021-30858 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-30858 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.