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Actively exploited · Published Feb 9, 2021 · Assigned by Chrome

CVE-2021-21148

High 8.8 Exploited

In plain English

A high-severity out-of-bounds write in Chrome from Google. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 20.0% (higher than 97% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)20.0%top 2.6% of all CVEs
Exploited in the wildYesCISA KEV since Nov 3, 2021
Attack tooling1Public PoC

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by Nov 17, 2021.

Official description

Heap buffer overflow in V8 in Google Chrome prior to 88.0.4324.150 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20nodejs14.15.5-r0ALPINE-CVE-2021-21148
Alpine:v3.21nodejs14.15.5-r0ALPINE-CVE-2021-21148
Alpine:v3.22nodejs14.15.5-r0ALPINE-CVE-2021-21148
Alpine:v3.23nodejs14.15.5-r0ALPINE-CVE-2021-21148
Alpine:v3.24nodejs14.15.5-r0ALPINE-CVE-2021-21148
Alpine:v3.20qt5-qtwebengine5.15.3_git20200401-r0ALPINE-CVE-2021-21148
Alpine:v3.21qt5-qtwebengine5.15.3_git20200401-r0ALPINE-CVE-2021-21148
Alpine:v3.22qt5-qtwebengine5.15.3_git20200401-r0ALPINE-CVE-2021-21148
Alpine:v3.23qt5-qtwebengine5.15.3_git20200401-r0ALPINE-CVE-2021-21148
Debian:12chromium88.0.4324.150-1DEBIAN-CVE-2021-21148
Debian:13chromium88.0.4324.150-1DEBIAN-CVE-2021-21148
Debian:14chromium88.0.4324.150-1DEBIAN-CVE-2021-21148

Affected products (as reported)

VendorProductVersions
Google Chrome unspecified – before 88.0.4324.150

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References