9.8

CVE-2021-26855

Warnung
Medienbericht
Exploit

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Microsoft ≫ Exchange Server Version2013 Updatecumulative_update_21
Microsoft ≫ Exchange Server Version2013 Updatecumulative_update_22
Microsoft ≫ Exchange Server Version2013 Updatecumulative_update_23
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_10
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_11
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_12
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_13
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_14
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_15
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_16
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_17
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_18
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_19
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_8
Microsoft ≫ Exchange Server Version2016 Updatecumulative_update_9
Microsoft ≫ Exchange Server Version2019 Update-
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_1
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_2
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_3
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_4
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_5
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_6
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_7
Microsoft ≫ Exchange Server Version2019 Updatecumulative_update_8

03.11.2021: CISA Known Exploited Vulnerabilities (KEV) Catalog

Microsoft Exchange Server Remote Code Execution Vulnerability

Schwachstelle

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Beschreibung

Apply updates per vendor instructions.

Erforderliche Maßnahmen
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 100% 1
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.5 10 6.4
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd@nist.gov 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
secure@microsoft.com 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-918 Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Für Zugriff zu Vulnerability Intelligence ist ein VulnDex Zugang erforderlich.
VulnDex Intel
Media Report
26.06.2026 21:08
http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html
Third Party Advisory
Exploit
VDB Entry
http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html
Third Party Advisory
Exploit
VDB Entry
http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html
Third Party Advisory
Exploit
VDB Entry
http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html
Third Party Advisory
Exploit
VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855
Patch
Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26855
US Government Resource