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CVE-2021-21193

8.8, high Known exploited

Google Chromium Blink Use-After-Free Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
10% higher than 95.5% of scored CVEs
Exploitation
Confirmed in the wild
Published
16 Mar 20215 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Nov 2021. US federal agencies had to remediate by 17 Nov 2021, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

Use after free in Blink in Google Chrome prior to 89.0.4389.90 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Details

Vendor
Google
Product
Chrome
Weakness
CWE-416 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
chrome-cve-admin@google.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References 6

Advisories 2

Other references 4

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Google CVEs

Every Google CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-58704 Google Pixel Improper Authorization Vulnerability KEV EPSS 0.6% 8.8, high
  • CVE-2026-87491 Google Chromium V8 Out of Bounds Write Vulnerability KEV EPSS 3% 8.8, high
  • CVE-2026-85046 Google Chromium V8 Type Confusion Vulnerability KEV EPSS 49% 8.8, high
  • CVE-2026-11645 Google Chromium V8 Out-of-Bounds Read and Write Vulnerability KEV EPSS 2% 8.8, high
  • CVE-2026-5281 Google Dawn Use-After-Free Vulnerability KEV EPSS 0.7% 8.8, high
  • CVE-2026-3909 Google Skia Out-of-Bounds Write Vulnerability KEV EPSS 2% 8.8, high
  • CVE-2026-3910 Google Chromium V8 Improper Restriction of Operations Within the Bounds of a Memory Buffer Vulnerability KEV EPSS 1% 8.8, high
  • CVE-2026-2441 Google Chromium CSS Use-After-Free Vulnerability KEV EPSS 55% 8.8, high

Beyond this page

Is CVE-2021-21193 in your network?

This page tells you how dangerous CVE-2021-21193 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2021-21193 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2021-21193 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.