Is CVE-2021-1871 actively exploited?

Yes. CVE-2021-1871 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-1871 be exploited remotely?

The attack vector of CVE-2021-1871 has not been classified yet.

What is the CVSS score of CVE-2021-1871?

CVE-2021-1871 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-1871

HIGHCISA KEVIN THE WILD

CVE-2021-1871

Published: November 3, 2021

EPSS:0.85%probability of exploitation in 30 daysPercentile:74.6th

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

This unspecified logic vulnerability in Apple iOS, iPadOS, and macOS WebKit allows a remote attacker to execute arbitrary code. This flaw can impact various HTML parsers, including Apple Safari and other products using WebKit. Its inclusion in CISA's KEV catalog signifies confirmed exploitation, making it a critical vulnerability.

Active exploitation of this vulnerability has been observed in the wild. The remote nature of the attack vector indicates it can be exploited without direct access to the target system.

Recommended Action

Users should update Apple iOS, iPadOS, and macOS to the latest versions. Ensure all applications that rely on WebKit for HTML processing are also updated.

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-2021-1871 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-2021-1871 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.