Is CVE-2021-1870 actively exploited?

Yes. CVE-2021-1870 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-1870 be exploited remotely?

The attack vector of CVE-2021-1870 has not been classified yet.

What is the CVSS score of CVE-2021-1870?

CVE-2021-1870 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-1870

HIGHCISA KEVIN THE WILD

CVE-2021-1870

Published: November 3, 2021

EPSS:1.15%probability of exploitation in 30 daysPercentile:78.2th

Official 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.

NVD Source

CISA KEV Advisory

Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability

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

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Apple iOS, iPadOS, and macOS WebKit contain an unspecified logic vulnerability that allows a remote attacker to execute code. This high-severity flaw affects HTML parsers using WebKit, including Safari, and is confirmed to be actively exploited in the wild. The EPSS score of 0.01151 indicates a low but present likelihood of exploitation.

This vulnerability is actively being exploited in the wild and is listed in CISA's KEV catalog. Exploitation can occur remotely through maliciously crafted web content.

Recommended Action

Update iOS, iPadOS, and macOS to the latest versions to patch the WebKit component. 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-2021-1870 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-2021-1870 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.