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CVE-2021-21132

42
FAUCET Score

CVE-2021-21132 describes an inappropriate implementation vulnerability in Google Chrome's DevTools, affecting versions prior to 88.0.4324.96, as well as Microsoft Edge Chromium. This critical vulnerability, with a CVSS score of 9.6, allows a remote attacker to potentially achieve a sandbox escape through a crafted Chrome Extension, leading to high impact on confidentiality, integrity, and availability. While no active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB) has been identified, the vulnerability has garnered significant community discussion and media coverage, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 88.0.4324.96CPE matchmatch criteria
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
< 88.0.705.50CPE matchmatch criteria
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.6CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
23.41%
Probability of exploitation in next 30 days
EPSS Percentile
97.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.2341 is in the 98th percentile among its peer group of 836 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: Microsoft Edge (Chromium-based)
googlevendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

microsoft2021-Jan/CVE-2021-21132

Chromium CVE-2021-21132: Inappropriate implementation in DevTools

Jan 12, 2021

References

chromereleases.googleblog.com / 2021/01/stable-channel-update-for-desktop_19.html
Release NotesVendor Advisory
crbug.com / 1128206
Permissions RequiredThird Party Advisory
msrc.microsoft.com / update-guide/en-US/vulnerability/CVE-2021-21132
Third Party Advisory