Vulnerability Details : CVE-2021-21127

Insufficient policy enforcement in extensions in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass content security policy via a crafted Chrome Extension.

Published 2021-02-09 14:15:16

Updated 2022-07-12 17:42:04

Source Chrome

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-21127

Probability of exploitation activity in the next 30 days: 0.40%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 71 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-21127

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
6.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:P	8.6	6.4	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.8	5.9	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High

References for CVE-2021-21127

https://crbug.com/1115590

1115590 - CSP Bypass via Chrome Extension
Exploit;Issue Tracking;Vendor Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21127

CVE-2021-21127 - Security Update Guide - Microsoft - Chromium CVE-2021-21127: Insufficient policy enforcement in extensions
Third Party Advisory
https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html

Chrome Releases: Stable Channel Update for Desktop
Release Notes;Vendor Advisory

CVEs referencing this url

Products affected by CVE-2021-21127

Microsoft » Edge Chromium
Versions before (<) 88.0.705.50
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
Matching versions
Google » Chrome
Versions before (<) 88.0.4324.96
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
Matching versions