Very High
CVE-2021-34473
CVE ID
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CVE-2021-34473
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
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Ratings
-
Attacker ValueVery High
-
ExploitabilityMedium
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!
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General Information
Vendors
- microsoft
Products
- exchange server 2013,
- exchange server 2016,
- exchange server 2019
Exploited in the Wild
- Government or Industry Alert (https://www.ic3.gov/Media/News/2022/220318.pdf)
- Threat Feed (https://cybersecurityworks.com/blog/ransomware/all-about-hive-ransomware.html)
- News Article or Blog (https://blog.talosintelligence.com/2021/07/microsoft-patch-tuesday-for-july-2021.html)
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Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
AttackerKB requires a CVE ID in order to pull vulnerability data and references from the CVE list and the National Vulnerability Database. If available, please supply below: