9.9

CVE-2021-26424: microsoft windows_10

CVSS: 9.9v3.1CriticalModified
Published 12-08-2021Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2021-26424 is a critical (CVSS 9.9) vulnerability in microsoft windows_10. EPSS estimates a 61.13% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.9/10
010
Critical · v3.1 (CVE.org)
EPSS score
61.13%
0%100%
Critical · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-08-2021
    PublishedVulnerability first disclosed.
  2. 10-08-2026
    Last modifiedVulnerability information updated.

Description

Windows TCP/IP Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

61.13%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 61.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
61.13%

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

No weakness data has been published for this record.

Affected systems

Microsoft27 products

1 vendor · 27 products

References

2 links