CVE-2021-26855

critical
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

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.

References

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

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/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html

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

Details

Source: MITRE

Published: 2021-03-03

Updated: 2021-05-21

Risk Information

CVSS v2

Base Score: 7.5

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

Impact Score: 6.4

Exploitability Score: 10

Severity: HIGH

CVSS v3

Base Score: 9.8

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

Impact Score: 5.9

Exploitability Score: 3.9

Severity: CRITICAL

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*

cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*

Tenable Plugins

View all (2 total)

IDNameProductFamilySeverity
147171Microsoft Exchange Server Authentication BypassNessusWindows
critical
147003Security Updates for Microsoft Exchange Server (March 2021)NessusWindows : Microsoft Bulletins
critical