Is CVE-2021-21206 actively exploited?

Yes. CVE-2021-21206 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-21206 be exploited remotely?

The attack vector of CVE-2021-21206 has not been classified yet.

What is the CVSS score of CVE-2021-21206?

CVE-2021-21206 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-21206

HIGHCISA KEVIN THE WILD

CVE-2021-21206

Published: November 3, 2021

EPSS:21.91%probability of exploitation in 30 daysPercentile:95.6th

Official Description

Google Chromium Blink contains a use-after-free vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

NVD Source

CISA KEV Advisory

Google Chromium Blink 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 Google Chromium Blink vulnerability is a use-after-free flaw that could allow a remote attacker to exploit heap corruption via a crafted HTML page. This affects multiple web browsers using Chromium. The high EPSS score indicates a significant likelihood of exploitation, and its presence in the KEV catalog confirms it has been actively exploited, making it a critical vulnerability for web browser users.

This vulnerability has been actively exploited in the wild. It is remotely exploitable through crafted HTML content.

Recommended Action

Users should ensure their web browsers (e.g., Google Chrome, Microsoft Edge, Opera) are updated to the latest versions. Exercise caution when visiting untrusted websites.

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-2021-21206 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-2021-21206 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.