Threat Intelligence / CVE / CVE-2021-38003

CVE-2021-38003 — Google Chrome

CISA KEV
CVSS v3.1 8.8 (HIGH) · EPSS 68.2% (higher than 98.6% of all scored CVEs) · Priority 9/10 · Published 2021-11-23

As of 2025-10-24, CVE-2021-38003 is a HIGH-severity vulnerability in Google Chrome, CVSS v3.1 8.8, EPSS 68.2% (98.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), with a US federal remediation deadline of 2021-11-17. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2021-38003, most recently “CVE-2026-51990: One-Click RCE in Tencent Sogou Input Method Exploited by UNC3569 to Deploy GrayRabbit Malware”.

Last updated: 2025-10-24

What is CVE-2021-38003?

Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

The record classifies CVE-2021-38003 under weakness class CWE-755. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 4 affected-product entries are recorded, across 3 vendors, listed below. The identifier was first published 1755 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (FIRST)
68.2% probability of exploitation in the next 30 days, higher than 98.6% of all scored CVEs
CISA KEV
Listed since 2021-11-03, federal remediation deadline 2021-11-17
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2021-11-23, last modified 2025-10-24

Is CVE-2021-38003 being exploited?

CISA added CVE-2021-38003 to the Known Exploited Vulnerabilities catalog on 2021-11-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2021-11-17 under BOD 22-01. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2021-38003

The record marks a vendor fix as available for CVE-2021-38003. Vendor advisory: https://chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html. Because CVE-2021-38003 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2021-11-17. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2021-38003

2 tracked threats in the Threadlinqs corpus reference CVE-2021-38003, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2021-38003 are available via the Threadlinqs MCP server (Purple tier). View plans →

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