Microsoft Exchange Server
CVE-2021-34470 — Microsoft Exchange Server Elevation of Privilege Vulnerability
Executive Summary
None
Overview
8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Adjacent_network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
3 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2013 Cumulative Update 23 | 5004778 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 10 | 5003612 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server 2016 Cumulative Update 21 | 5003611 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
5004778 |
Security Update | Yes |
5003612 |
Security Update | Yes |
5003611 |
Security Update | Yes |
Exploits & PoC
1 public PoCUnverified third-party code
Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.
| Repository | Stars | Published | Description |
|---|---|---|---|
| technion/CVE-2021-34470scanner | 2 | 2021-07-29 | A Powrshell script to scan for CVE-2021-34470 |
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
James Forshaw of Google Project Zero with
References
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