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Full vulnerability report · 2021
CVE-2021-21183High confidence

Inappropriate implementation in performance APIs in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page

Google · Chrome

4.3MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2021-8574

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Inappropriate implementation in performance APIs in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

What

Inappropriate implementation in performance APIs in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

Why

The product does not properly verify that the source of data or communication is valid.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Inappropriate implementation in performance APIs in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

Why

The product does not properly verify that the source of data or communication is valid.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Origin Validation Error → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-346 ↗

CWE-346: Origin Validation Error. The product does not properly verify that the source of data or communication is valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-346Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

CERT-FR · French · CERTFR-2021-AVI-167Multiples vulnérabilités dans Microsoft Edge

d?id=CVE-2021-21174 Référence CVE CVE-2021-21175 https://www.cve.org/CVERecord?id=CVE-2021-21175 Référence CVE CVE-2021-21176 https://www.cve.org/CVERecord?id=CVE-2021-21176 Référence CVE CVE-2021-21177 https://www.cve.org/CVERecord?id=CVE-2021-21177 Référence CVE CVE-2021-21178 https://www.cve.org/CVERecord?id=CVE-2021-21178 Référence CVE CVE-2021-21179 https://www.cve.org/CVERecord?id=CVE-2021-21179 Référence CVE CVE-2021-21180 https://www.cve.org/CVERecord?id=CVE-2021-21180 Référence CVE CVE-2021-21181 https://www.cve.org/CVERecord?id=CVE-2021-21181 Référence CVE CVE-2021-21182 https://www.cve.org/CVERecord?id=CVE-2021-21182 Référence CVE CVE-2021-21183 https://www.cve.org/CVERecord?id=CVE-2021-21183 Référence CVE CVE-2021-21184 https://www.cve.org/CVERecord?id=CVE-2021-21184 Référence CVE CVE-2021-21185 https://www.cve.org/CVERecord?id=CVE-2021-21185 Référence CVE CVE-2021-21186 https://www.cve.org/CVERecord?id=CVE-2021-21186 Référence CVE CVE-2021-21187 https://www.cve.org/CVERecord?id=CVE-2021-21187 Référence CVE CVE-2021-21188 https://www.cve.org/CVERecord?id=CVE-2021-21188 Référence CVE CVE-2021-21189 https://www.cve.org/CVERecord?id=CVE-2021-21189 Référence CVE CVE-2021-21190 https://www.cve.org/CVERecord?id=CVE-2021-21190 Gestion détaillée du document le 05 mars 2021 Version initiale

Official advisory
CERT-FR · French · CERTFR-2021-AVI-162Multiples vulnérabilités dans Google Chrome

d?id=CVE-2021-21174 Référence CVE CVE-2021-21175 https://www.cve.org/CVERecord?id=CVE-2021-21175 Référence CVE CVE-2021-21176 https://www.cve.org/CVERecord?id=CVE-2021-21176 Référence CVE CVE-2021-21177 https://www.cve.org/CVERecord?id=CVE-2021-21177 Référence CVE CVE-2021-21178 https://www.cve.org/CVERecord?id=CVE-2021-21178 Référence CVE CVE-2021-21179 https://www.cve.org/CVERecord?id=CVE-2021-21179 Référence CVE CVE-2021-21180 https://www.cve.org/CVERecord?id=CVE-2021-21180 Référence CVE CVE-2021-21181 https://www.cve.org/CVERecord?id=CVE-2021-21181 Référence CVE CVE-2021-21182 https://www.cve.org/CVERecord?id=CVE-2021-21182 Référence CVE CVE-2021-21183 https://www.cve.org/CVERecord?id=CVE-2021-21183 Référence CVE CVE-2021-21184 https://www.cve.org/CVERecord?id=CVE-2021-21184 Référence CVE CVE-2021-21185 https://www.cve.org/CVERecord?id=CVE-2021-21185 Référence CVE CVE-2021-21186 https://www.cve.org/CVERecord?id=CVE-2021-21186 Référence CVE CVE-2021-21187 https://www.cve.org/CVERecord?id=CVE-2021-21187 Référence CVE CVE-2021-21188 https://www.cve.org/CVERecord?id=CVE-2021-21188 Référence CVE CVE-2021-21189 https://www.cve.org/CVERecord?id=CVE-2021-21189 Référence CVE CVE-2021-21190 https://www.cve.org/CVERecord?id=CVE-2021-21190 Gestion détaillée du document le 04 mars 2021 Version initiale

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
unspecified < 89.0.4389.72
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 9 Mar 2021 · Last source change 3 Aug 2024, 18:01 UTC · CWE-346 · Origin Validation Error

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2021-8574
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2021-8574↗CVE authority or vendor reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-21183 · cve.blacktree.nl