CVE-2021-21193

HIGH KEV

Google Chrome <89.0.4389.90 - Use After Free

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-21193 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021. EIP tracks 1 public exploit from researchers including mehrzad1994.

AI-analyzed exploit summary This repository provides a detailed technical analysis of CVE-2021-21193, a use-after-free vulnerability in Google Chrome's Blink engine. It includes an explanation of the vulnerability, its impact, and the mechanics of use-after-free exploits, but does not contain functional exploit code.

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.

Exploits (1)

nomisec WRITEUP
by mehrzad1994 · poc
https://github.com/mehrzad1994/CVE-2021-21193

This repository provides a detailed technical analysis of CVE-2021-21193, a use-after-free vulnerability in Google Chrome's Blink engine. It includes an explanation of the vulnerability, its impact, and the mechanics of use-after-free exploits, but does not contain functional exploit code.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Theoretical
Target: Google Chrome prior to 89.0.4389.90
No auth needed
Prerequisites: Victim interaction (e.g., visiting a crafted HTML page)
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (6)

Core 6
Core References
Permissions Required x_refsource_misc
https://crbug.com/1186287
Mailing List, Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4886
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202104-08

Scores

CVSS v3 8.8
EPSS 0.0987
EPSS Percentile 95.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2021-11-03
VulnCheck KEV 2021-03-09
InTheWild.io 2021-03-09
ENISA EUVD EUVD-2021-8584
CWE
CWE-416
Status published
Products (3)
debian/debian_linux 10.0
fedoraproject/fedora 32
google/chrome < 89.0.4389.90
Published Mar 16, 2021
KEV Added Nov 03, 2021
Tracked Since Feb 18, 2026