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kasperskyKaspersky LabKLA12103
HistoryMar 02, 2021 - 12:00 a.m.

KLA12103 ACE vulnerabilities in Microsoft Exchange Server

2021-03-0200:00:00
Kaspersky Lab
threats.kaspersky.com
471

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.4 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.975 High

EPSS

Percentile

100.0%

Detect date:

03/02/2021

Severity:

Critical

Description:

Remote code execution vulnerabilities were found in Microsoft Exchange Server. Malicious users can exploit this vulnerability to execute arbitrary code.

Exploitation:

This vulnerability can be exploited by the following malware:

Affected products:

Microsoft Exchange Server 2019 Cumulative Update 8
Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2016 Cumulative Update 18
Microsoft Exchange Server 2010 Service Pack 3
Microsoft Exchange Server 2016 Cumulative Update 19
Microsoft Exchange Server 2019 Cumulative Update 7

Solution:

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

Original advisories:

CVE-2021-26412
CVE-2021-26855
CVE-2021-27078
CVE-2021-27065
CVE-2021-26854
CVE-2021-26857
CVE-2021-26858

Impacts:

ACE

Related products:

Microsoft Exchange Server

CVE-IDS:

CVE-2021-264129.1Critical
CVE-2021-268559.1Critical
CVE-2021-270789.1Critical
CVE-2021-270657.8Critical
CVE-2021-268546.6High
CVE-2021-268577.8Critical
CVE-2021-268587.8Critical

KB list:

5000871
5000978

Microsoft official advisories:

References

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.4 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.975 High

EPSS

Percentile

100.0%