Is CVE-2021-30661 actively exploited?

Yes. CVE-2021-30661 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-30661 be exploited remotely?

The attack vector of CVE-2021-30661 has not been classified yet.

What is the CVSS score of CVE-2021-30661?

CVE-2021-30661 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-30661

HIGHCISA KEVIN THE WILD

CVE-2021-30661

Published: November 3, 2021

EPSS:0.16%probability of exploitation in 30 daysPercentile:36.5th

Official Description

Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari WebKit Storage 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 Multiple Products WebKit Storage Use-After-Free Vulnerability

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

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This use-after-free vulnerability in Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari WebKit Storage can lead to code execution when processing maliciously crafted web content. This high-severity flaw is actively exploited in the wild, making it a critical threat to users of affected Apple products and other WebKit-reliant applications.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog, indicating confirmed real-world impact. Exploitation can occur through maliciously crafted web content.

Recommended Action

Apple users should apply all available security updates for iOS, iPadOS, macOS, tvOS, watchOS, and Safari. Ensure all web browsers and applications relying on WebKit are kept up to date.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-30661 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-2021-30661 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.