6.6

CVE-2021-26854: microsoft exchange_server

CVSS: 6.6v3.1MediumModified
Published 02-03-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-26854 is a medium (CVSS 6.6) vulnerability in microsoft exchange_server. EPSS estimates a 24.74% chance of exploitation in the next 30 days, higher than 97.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.6/10
010
Medium · v3.1 (CVE.org)
EPSS score
24.74%
0%100%
High · +1.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-03-2021
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

24.74%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

+1.16 pp

From 23.58% on 19-09-2026

19-09-202619-10-2026
EPSS score
24.74%

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

Microsoft6 products

1 vendor · 6 products

References

2 links