Remote code execution in Microsoft Exchange Server

Published: 2020-09-08
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-16875
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Microsoft Exchange Server
Server applications / Mail servers

Vendor Microsoft

Security Advisory

This security advisory describes one high risk vulnerability.

1) Buffer overflow

Risk: High

CVSSv3.1: 9.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-16875

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: Yes


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

The vulnerability exists due to a boundary error when processing email messages. A remote attacker can send as specially crafted email to the Exchange server, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2016, 2016 Cumulative Update 1, 2016 Cumulative Update 2, 2016 Cumulative Update 3, 2016 Cumulative Update 4, 2016 Cumulative Update 5, 2016 Cumulative Update 6, 2016 Cumulative Update 7, 2016 Cumulative Update 8, 2016 Cumulative Update 9, 2016 Cumulative Update 10, 2016 Cumulative Update 11, 2016 Cumulative Update 12, 2016 Cumulative Update 13, 2016 Cumulative Update 14, 2016 Cumulative Update 15, 2016 Cumulative Update 16, 2016 Cumulative Update 17, 2019, 2019 Cumulative Update 1, 2019 Cumulative Update 2, 2019 Cumulative Update 3, 2019 Cumulative Update 4, 2019 Cumulative Update 5, 2019 Cumulative Update 6

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.