CVE-2021-4321

View on CVE.org

Published Jul 28, 2023 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Description

Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Google

Chrome

affected

Version	Status	Constraints
`91.0.4472.77`	affected	< 91.0.4472.77

Configuration 1 [-]

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-34150	Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.538% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
https://crbug.com/1161891
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PQKT7EGDD2P3L7S3NXEDDRCPK4NNZNWJ/

History

Jul 13, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00106}`	epss `{'score': 0.00108}`

Subscriptions

Google Chrome

Weaknesses

NVD-CWE-noinfo

Sources

CVE record Updated: Feb 13, 2025, 4:28 PM

Status: PUBLISHED
Assigner: Chrome
Published: Jul 28, 2023, 11:26 PM
Updated: Feb 13, 2025, 4:28 PM
Reserved: Feb 12, 2023, 9:19 PM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 4:19 AM

Status: Modified
Published: Jul 29, 2023, 12:15 AM
Modified: Jun 17, 2026, 4:19 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"affected": [{"affectedData": [{"product": "Chrome", "vendor": "Google", "versions": [{"lessThan": "91.0.4472.77", "status": "affected", "version": "91.0.4472.77", "versionType": "custom"}]}], "source": "chrome-cve-admin@google.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "matchCriteriaId": "E013E0FE-A60A-4C98-91CA-F5D06FD43116", "versionEndExcluding": "91.0.4472.77", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)"}], "id": "CVE-2021-4321", "lastModified": "2026-06-17T04:19:30.103", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2023-07-29T00:15:10.553", "references": [{"source": "chrome-cve-admin@google.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html"}, {"source": "chrome-cve-admin@google.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://crbug.com/1161891"}, {"source": "chrome-cve-admin@google.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PQKT7EGDD2P3L7S3NXEDDRCPK4NNZNWJ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://crbug.com/1161891"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PQKT7EGDD2P3L7S3NXEDDRCPK4NNZNWJ/"}], "sourceIdentifier": "chrome-cve-admin@google.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}