Threats / Google / CVE-2021-38000
CVE-2021-38000
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Google Chromium Intents vulnerability
Chromium Intents improperly validates input, allowing remote attackers to redirect browsers to malicious URLs via crafted HTML pages.
Verdict
Today item — known-exploited.
A remote attacker can craft HTML to exploit improper input validation in Chromium Intents, causing arbitrary browser navigation to attacker-controlled URLs. This affects multiple Chromium-based browsers and has been exploited in the wild.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.04485 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Google, Chromium Intents. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-20 Improper Input Validation.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious HTML page containing a specially formed intent that bypasses input validation.
Business
Users are exposed to phishing, malware distribution, or credential harvesting through forced navigation to attacker-controlled sites.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I host the HTML page and distribute it via email, social engineering, or compromised websites to reach target users.
Business
Attack surface expands across multiple Chromium-based browsers, increasing organizational risk and potential for widespread compromise.
3
Lateral reach — past segmentation narrative 3
Attacker
I redirect victims to landing pages that harvest credentials, deliver malware, or perform drive-by downloads.
Business
Compromised user accounts, infected endpoints, and data exfiltration result in operational disruption and potential regulatory exposure.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05