Is CVE-2021-21193 actively exploited?

Yes. CVE-2021-21193 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-21193 be exploited remotely?

The attack vector of CVE-2021-21193 has not been classified yet.

What is the CVSS score of CVE-2021-21193?

CVE-2021-21193 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-21193

HIGHCISA KEVIN THE WILD

CVE-2021-21193

Published: November 3, 2021

EPSS:14.80%probability of exploitation in 30 daysPercentile:94.4th

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 use-after-free vulnerability in Google Chromium Blink allows a remote attacker to potentially exploit heap corruption by crafting a malicious HTML page. This flaw affects multiple web browsers utilizing Chromium, posing a significant risk of arbitrary code execution. Its high severity and confirmed exploitation in the wild, coupled with an EPSS score of 0.14800, make it a critical threat.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. It is remotely exploitable via a crafted HTML page.

Recommended Action

Update all affected web browsers, including Google Chrome, Microsoft Edge, and Opera, to the latest secure versions. Regularly apply security updates to web browsers to mitigate such vulnerabilities.

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-2021-21193 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-2021-21193 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.