Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
🛡️
CISA KEV · ACTIVELY EXPLOITED
MEDIUM severity

CVE-2021-38000 — Chrome

MEDIUM

CVE-2021-38000 is a medium-severity (CVSS 6.1) Open Redirect vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

Published
Updated
Affected
3 products
Patched
See advisory
Exploits
4 known
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2021-11-03. Federal agencies were required to remediate by 2021-11-17.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2021-38000.

EPSS Exploitation Probability

via FIRST.org ↗
4.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk
3.67%4.26%4.86%5.45%4.5%4.9%Apr 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-38000 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Insufficient validation of untrusted input in Intents in Google Chrome on Android prior to 95.0.4638.69 allowed a remote attacker to arbitrarily browser to a malicious URL via a crafted HTML page.

Affected Products

3 products · 4 configurations
OS
debian linuxdebian
2 versions
10.011.0
OS
fedorafedoraproject
1 version
34
Application
chromegoogle
< 95.0.4638.69
range
Exploits & PoCs
4

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Insufficient validation of untrusted input in Intents in Google Chrome o…

chromereleases.googleblog.comChromeOct 2021

Insufficient validation of untrusted input in Intents in Google Chrome o…

chromereleases.googleblog.comGoogle-sheetSep 2021

Insufficient validation of untrusted input in Intents in Google Chrome o…

cisa.govCISANov 2021

Insufficient validation of untrusted input in Intents in Google Chrome o…

crbug.comNVDJul 2024

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2021-38000 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

Insufficient validation of untrusted input in Intents in Google Chrome on Android prior to 95.0.4638.69 allowed a remote attacker to arbitrarily browser to a malicious URL via a crafted HTML page.
O3 Security · Impact-Aware SCA

Is CVE-2021-38000 in your dependencies?

Find it across , including transitive dependencies.

Scan my dependencies How O3 SCA works
Actively Exploited: CVE-2021-38000: Chrome (Medium 6.1)