Attacker Value
High
4
CVE-2021-33766 ProxyToken
4
CVE ID
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Attacker Value
High
(1 user assessed)Exploitability
Very High
(1 user assessed)User Interaction
Unknown
Privileges Required
Unknown
Attack Vector
Unknown
4
CVE-2021-33766 ProxyToken
(Last updated November 28, 2024) ▾
MITRE ATT&CK
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Collection
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Command and Control
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Credential Access
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Defense Evasion
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Exfiltration
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Persistence
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What makes this of high-value to an attacker?
What makes this of low-value to an attacker?
Description
Microsoft Exchange Server Information Disclosure Vulnerability
Add Assessment
3
Ratings
-
Attacker ValueHigh
-
ExploitabilityVery High
Technical Analysis
An unauthenticated actor can perform configuration actions on mailboxes belonging to arbitrary users. Which can be used to copy all emails addressed to a target and account and forward them to an account controlled by the threat actor.
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Delete Assessment Only Delete Assessment and Exploited in the Wild ReportCVSS V3 Severity and Metrics
Data provided by the National Vulnerability Database (NVD)
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
Unknown
Attack Vector (AV):
Unknown
Attack Complexity (AC):
Unknown
Privileges Required (PR):
Unknown
User Interaction (UI):
Unknown
Scope (S):
Unknown
Confidentiality (C):
Unknown
Integrity (I):
Unknown
Availability (A):
Unknown
General Information
Offensive Application
primitive
Utility Class
infoleak
Ports
Unknown
OS
Unknown
Vulnerable Versions
Microsoft Exchange Server 2019 Cumulative Update 9
Microsoft Exchange Server 2016 Cumulative Update 20
Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2016 Cumulative Update 19
Microsoft Exchange Server 2019 Cumulative Update 8
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown
Vendors
- microsoft
Products
- exchange server 2013,
- exchange server 2016,
- exchange server 2019
Exploited in the Wild
gwillcox-r7
indicated sources as
- Government or Industry Alert (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
- News Article or Blog (https://unit42.paloaltonetworks.com/network-attacks-trends-august-october-2021/)
Would you like to delete this Exploited in the Wild Report?
Yes, delete this reportAttackerKB Worker indicated source as
Government or Industry Alert (https://www.cisa.gov/news-events/alerts/2022/01/18/cisa-adds-13-known-exploited-vulnerabilities-catalog)
Would you like to delete this Exploited in the Wild Report?
Yes, delete this reportReferences
Additional Info
Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Rapid7
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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