CVE-2021-26855

Severity

98%

Complexity

39%

Confidentiality

98%

Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078.

CVSS 3.1 Base Score 9.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P).

Overview

Type

Microsoft Exchange Server

First reported 3 years ago

2021-03-03 00:15:00

Last updated 3 years ago

2021-05-21 18:15:00

Affected Software

Microsoft Exchange Server 2013 Cumulative Update 23

2013

Microsoft Exchange Server 2013 Cumulative Update 21

2013

Microsoft Exchange Server 2013 Cumulative Update 22

2013

Microsoft Exchange Server 2016 Cumulative Update 10

2016

Microsoft Exchange Server 2016 Cumulative Update 11

2016

Microsoft Exchange Server 2016 Cumulative Update 12

2016

Microsoft Exchange Server 2016 Cumulative Update 13

2016

Microsoft Exchange Server 2016 Cumulative Update 14

2016

Microsoft Exchange Server 2016 Cumulative Update 15

2016

Microsoft Exchange Server 2016 Cumulative Update 16

2016

Microsoft Exchange Server 2016 Cumulative Update 8

2016

Microsoft Exchange Server 2016 Cumulative Update 9

2016

Microsoft Exchange Server 2019

2019

Microsoft Exchange Server 2019 Cumulative Update 1

2019

Microsoft Exchange Server 2019 Cumulative Update 2

2019

Microsoft Exchange Server 2019 Cumulative Update 3

2019

Microsoft Exchange Server 2019 Cumulative Update 4

2019

Microsoft Exchange Server 2019 Cumulative Update 5

2019

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855

Patch, Vendor Advisory

http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html

http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html

http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html

Exploit, Third Party Advisory, VDB Entry

http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html

Exploit, Third Party Advisory

http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html

http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html

Exploit, Third Party Advisory, VDB Entry

http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html

Exploit, Third Party Advisory, VDB Entry

http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html

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