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CVE-2021-38003

83
FAUCET Score

CVE-2021-38003 is a critical vulnerability in Google Chrome's V8 JavaScript engine, affecting versions prior to 95.0.4638.69, including various Debian and Fedora distributions. This high-severity flaw (CVSS 8.8) allows a remote attacker to achieve heap corruption and potentially execute arbitrary code by enticing a user to visit a specially crafted HTML page. The vulnerability has been actively exploited as a zero-day in the wild, as confirmed by its presence in the KEV catalog and numerous media reports, despite a lack of public exploit code. Community discussion surrounding this CVE is exceptionally high, indicating significant attention from the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
< 95.0.4638.69CPE matchmatch criteria
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
38.57%
Probability of exploitation in next 30 days
EPSS Percentile
98.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Nov 3, 2021
This CVE's current EPSS score of 0.3857 is in the 99th percentile among its peer group of 14,852 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

microsoftpatch availablevia msrc
Product: Microsoft Edge (Chromium-based)Fixed in: 95.0.1020.40

Vendor Advisories (1)

microsoft2021-Oct/CVE-2021-38003

Chromium: CVE-2021-38003 Inappropriate implementation in V8

Oct 12, 2021

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
chromereleases.googleblog.com / 2021/10/stable-channel-update-for-desktop_28.html
Release Notes
crbug.com / 1263462
ExploitIssue Tracking
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744
Release Notes
debian.org / security/2022/dsa-5046
Mailing ListThird Party Advisory