5

CVE-2021-42308: microsoft edge_chromium Authentication Bypass by Spoofing

CVSS: 5.0v2.0MediumModified
Published 24-11-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-42308 is a medium (CVSS 5.0) Authentication Bypass by Spoofing vulnerability in microsoft edge_chromium. EPSS estimates a 1.34% chance of exploitation in the next 30 days, higher than 70.8% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
5.0/10
010
Medium · v2.0 (NVD)
EPSS score
1.34%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-11-2021
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Edge (Chromium-based) Spoofing Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.34%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

+0.01 pp

From 1.33% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft2 products

1 vendor · 2 products

References

2 links