CVE-2021-31207
MEDIUM KEV RANSOMWAREMicrosoft Exchange Server - Unrestricted File Upload
Title source: ruleDescription
Microsoft Exchange Server Security Feature Bypass Vulnerability
Exploits (7)
metasploit
WORKING POC
EXCELLENT
by Orange Tsai, Jang (@testanull), PeterJson, brandonshi123, mekhalleh (RAMELLA Sébastien), Donny Maasland, Rich Warren, Spencer McIntyre, wvu · rubypocwindows
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/exchange_proxyshell_rce.rb
patchapalooza
SCANNER
by cyberheartmi9 · infoleak
https://github.com/cyberheartmi9/Proxyshell-Scanner
References (4)
Scores
CVSS v3
6.6
EPSS
0.9396
EPSS Percentile
99.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Details
CISA KEV
2021-11-03
VulnCheck KEV
2021-08-30
InTheWild.io
2021-08-24
ENISA EUVD
EUVD-2021-18120
Ransomware Use
Confirmed
CWE
CWE-434
Status
published
Products (3)
microsoft/exchange_server
2013 cumulative_update_23
microsoft/exchange_server
2016 cumulative_update_19 (2 CPE variants)
microsoft/exchange_server
2019 cumulative_update_8 (2 CPE variants)
Published
May 11, 2021
KEV Added
Nov 03, 2021
Tracked Since
Feb 18, 2026