CVE-2021-21133

MEDIUMNVD 6.56.5—

6.5

Insufficient policy enforcement in Downloads in Google Chrome prior to 88.0.4324.96 allowed an attacker who convinced a user to download files to bypass navigation restrictions via a crafted HTML page.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 93.9%
KEV: Not listed

Published

February 9, 2021

Last Modified

November 21, 2024

References (6)

chrome-cve-admin@googlehttps://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html
chrome-cve-admin@googlehttps://crbug.com/1157743
chrome-cve-admin@googlehttps://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21133
af854a3a-2127-422b-91ae-364da2661108https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html
af854a3a-2127-422b-91ae-364da2661108https://crbug.com/1157743
af854a3a-2127-422b-91ae-364da2661108https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21133

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-287Improper Authentication

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2021-211332021-01-21
Chromium CVE-2021-21133: Insufficient policy enforcement in Downloads

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 21:07 UTCEG score recompute
2026-05-26 21:07 UTCVendor advisory
2026-05-26 21:07 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch

Frequently asked(5)

What is CVE-2021-21133?

CVE-2021-21133 is a medium vulnerability published on February 9, 2021. Insufficient policy enforcement in Downloads in Google Chrome prior to 88.0.4324.96 allowed an attacker who convinced a user to download files to bypass navigation restrictions via a crafted HTML page.

When was CVE-2021-21133 disclosed?

CVE-2021-21133 was first published in the National Vulnerability Database on February 9, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-21133 actively exploited?

CVE-2021-21133 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-21133?

CVE-2021-21133 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2021-21133?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21133, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-21133

Published

Last Modified

References (6)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-21133?

Same vendor

Same CWE

CVE-2021-21133

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-21133?

🔗 Related CVEs(same vendor + same CWE)

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References (6)

Frequently asked(5)

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