Attacker Value
Very High
CVE-2021-34473
CVE-2021-34473
(Last updated December 29, 2023) ▾
MITRE ATT&CK
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Metasploit Module
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2
Technical Analysis
From https://blog.talosintelligence.com/2021/07/microsoft-patch-tuesday-for-july-2021.html there was a note that this vulnerability seems to have been used in some Exchange Server APT attacks detailed at https://blog.talosintelligence.com/2021/03/hafnium-update.html however it wasn’t disclosed that this vulnerability was patched despite being patched back in April 2021. Since this was under active exploitation it is recommended to patch this vulnerability if you haven’t applied April 2021’s patch updates already.
Successful exploitation will result in RCE on affected Exchange Servers, and requires no prior user privileges, so patch this soon!
CVSS V3 Severity and Metrics
Data provided by the National Vulnerability Database (NVD)
Base Score:
9.1 Critical
Impact Score:
5.2
Exploitability Score:
3.9
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
None
General Information
Vendors
- microsoft
Products
- exchange server 2013,
- exchange server 2016,
- exchange server 2019
Metasploit Modules
Exploited in the Wild
References
