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Fencer Vulns
high 8.8

CVE-2021-37975 kev in the critical feed json

Use after free in V8 in Google Chrome prior to 94.0.4606.71 allowed a remote attacker to potentially exploit heap corruption via a crafted…

published 2021-10-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24448

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
34.9%
EPSS 34.9% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

Use after free in V8 in Google Chrome prior to 94.0.4606.71 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • Google Chrome 94.0.4606.71
  • chromium Debian 14, Debian 13, Debian 12 97.0.4692.71-0.1

debian advisories DEBIAN-CVE-2021-37975

  • chromium-browser Ubuntu 18.04 LTS 94.0.4606.71-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2021-37975

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium openSUSE Tumbleweed 94.0.4606.71-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • opera openSUSE Leap 15.4 NonFree 85.0.4341.28-lp154.2.5.1
  • opera openSUSE Leap 15.3 NonFree 80.0.4170.63-lp153.2.27.1
  • opera openSUSE Leap 15.2 NonFree 80.0.4170.63-lp152.2.73.1
  • opera openSUSE Leap 15.3 NonFree, openSUSE Leap 15.2 NonFree 80.0.4170.16-lp153.2.24.1
  • chromium openSUSE Leap 15.2 94.0.4606.81-lp152.2.132.1
  • chromium Package Hub 15 SP3, openSUSE Leap 15.3 94.0.4606.71-bp153.2.31.1

opensuse advisories openSUSE-SU-2024:11555-1openSUSE-SU-2024:12948-1openSUSE-SU-2022:0110-1openSUSE-SU-2021:1434-1openSUSE-SU-2021:1433-1openSUSE-SU-2021:1358-1

  • qt5-qtwebengine Alpine 3.14 5.15.3_git20211006-r1
  • qt5-qtwebengine Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 5.15.3_git20211006-r3

alpine advisories ALPINE-CVE-2021-37975

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium Arch Linux 94.0.4606.71-1
  • vivaldi Arch Linux 4.2.2406.54-1

arch linux advisories AVG-2433AVG-2435

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-37975 updated cvss 8.8

chromium-browser: Use after free in V8

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Found exploited as a 0-day (Project Zero)
  2. 0-day patched (Project Zero)
  3. Published
  4. Added to CISA KEV
  5. CISA patch deadline
  6. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2021-11-17 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Google, Chromium V8
CISA name
Google Chromium V8 Use-After-Free Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Found
2021-09-24
Patched
2021-09-30
Details
project zero root cause analysis

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1059.007 JavaScript exploitation
  • T1203 Exploitation for Client Execution primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

34.89% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Google Chrome

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.