CVE-2021-38000Known exploitationPublic exploitNetwork attack vector

External-browser redirection via unchecked intent navigation

Published Nov 23, 2021 · Updated Oct 21, 2025

Open redirect in Google Chrome on Android before 95.0.4638.69 allows remote attackers to open a malicious URL via crafted HTML. ExternalNavigationHandler accepts a server-controlled intent URL reached through an HTTP 302 redirect and transfers navigation to another browser without a chooser or warning. A target must open the attacker's link; the redirect then launches an attacker-selected URL in an external browser, enabling follow-on browser exploitation.

CVSS severity6.1
Medium
EPSS probability4.95%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Google Chrome on Android before 95.0.4638.69 allows remote attackers to open a malicious URL via crafted HTML. ExternalNavigationHandler accepts a server-controlled intent URL reached through an HTTP 302 redirect and transfers navigation to another browser without a chooser or warning. A target must open the attacker's link; the redirect then launches an attacker-selected URL in an external browser, enabling follow-on browser exploitation.

The record

CVE
CVE-2021-38000
Published
Nov 23, 2021
Updated
Oct 21, 2025
Vendor
Google
Product
Android
Classifications
CWE-20, CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google · Androidversion=-
Google · Google Chromeversion=0 <95.0.4638.69; version=unspecified <95.0.4638.69

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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