9.8

CVE-2021-26877: microsoft windows_server_2008

CVSS: 9.8v3.1CriticalModified
Published 11-03-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-26877 is a critical (CVSS 9.8) vulnerability in microsoft windows_server_2008. EPSS estimates a 17.74% chance of exploitation in the next 30 days, higher than 97.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
17.74%
0%100%
Medium · +1.21 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-03-2021
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Windows DNS Server Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

17.74%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

+1.21 pp

From 16.53% on 22-09-2026

22-09-202622-10-2026
EPSS score
17.74%

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

Microsoft16 products

1 vendor · 16 products

References

2 links