Multiple vulnerabilities in Microsoft Exchange Server



Published: 2021-03-03 | Updated: 2022-09-27
Risk Critical
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2021-26412
CVE-2021-26854
CVE-2021-26855
CVE-2021-26857
CVE-2021-26858
CVE-2021-27065
CVE-2021-27078
CWE-ID CWE-20
CWE-918
Exploitation vector Network
Public exploit Vulnerability #3 is being exploited in the wild.
Vulnerability #4 is being exploited in the wild.
Vulnerability #5 is being exploited in the wild.
Vulnerability #6 is being exploited in the wild.
Vulnerable software
Subscribe
Microsoft Exchange Server
Server applications / Mail servers

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU51174

Risk: High

CVSSv3.1:

CVE-ID: CVE-2021-26412

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to the Exchange server and execute arbitrary code on the system.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 19 15.01.2176.002


CPE2.3 External links

http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26412

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Input validation error

EUVDB-ID: #VU51173

Risk: High

CVSSv3.1:

CVE-ID: CVE-2021-26854

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to the Exchange server and execute arbitrary code on the system.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 19 15.01.2176.002


CPE2.3 External links

http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26854

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU51171

Risk: Critical

CVSSv3.1:

CVE-ID: CVE-2021-26855

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted HTTP request to the Microsoft Exchange OWA interface, upload arbitrary file on the server and execute it.

Note, this vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 19 15.01.2176.002


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855
http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server
http://github.com/microsoft/CSS-Exchange/tree/main/Security

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

4) Input validation error

EUVDB-ID: #VU51170

Risk: Critical

CVSSv3.1:

CVE-ID: CVE-2021-26857

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to the Exchange server and execute arbitrary code on the system.

Note, this vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 18 15.01.2106.002


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857
http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

5) Input validation error

EUVDB-ID: #VU51169

Risk: Critical

CVSSv3.1:

CVE-ID: CVE-2021-26858

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to the Exchange server and execute arbitrary code on the system.

Note, this vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 19 15.01.2176.002


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858
http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

6) Input validation error

EUVDB-ID: #VU51168

Risk: Critical

CVSSv3.1:

CVE-ID: CVE-2021-27065

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to the Exchange server and execute arbitrary code on the system.

Note, this vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 19 15.01.2176.002


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27065
http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

7) Input validation error

EUVDB-ID: #VU51172

Risk: High

CVSSv3.1:

CVE-ID: CVE-2021-27078

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted data to the Exchange server and execute arbitrary code on the system.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 RTM 15.00.0516.032 - 2013 Cumulative Update 23 15.00.1497.002, 2019 RTM 15.02.0221.012 - 2019 Cumulative Update 8 15.02.0792.003, 2016 RTM 15.01.0225.042 - 2016 Cumulative Update 19 15.01.2176.002


CPE2.3 External links

http://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27078

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



###SIDEBAR###