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Vulnerability record · public intelligence
CVE-2021-21163
MEDIUM
CVE-2021-21163
Published Mar 9, 2021 · Updated Oct 23, 2026
Severity · CVSSMEDIUM · 6.5
Known exploitationNot listed
EPSS / likelihood0.94%
QFinch risk scoreNot available
Original summary
Normalized public record · Updated Oct 23, 2026
Insufficient data validation in Reader Mode in Google Chrome on iOS prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page and a malicious server.
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Insufficient data validation in Reader Mode in Google Chrome on iOS prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page and a malicious server.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
CVENVDEPSS
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- chromereleases.googleblog.com ↗
- crbug.com ↗
- FEDORA-2021-c88a96bd4b ↗
- FEDORA-2021-4740239e28 ↗
- FEDORA-2021-78547312f2 ↗
- DSA-4886 ↗
- GLSA-202104-08 ↗
Record history
Published Mar 9, 2021 · Last refreshed Oct 23, 2026