Microsoft Exchange Server
CVE-2020-17143 — Microsoft Exchange Server Information Disclosure Vulnerability
Executive Summary
None
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.9
EPSS Score
0.70632
probability of exploitation in the next 30 days
0.99326 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
5 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2013 Cumulative Update 23 | 4593466 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2016 Cumulative Update 17 | 4593465 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2016 Cumulative Update 18 | 4593465 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2019 Cumulative Update 6 | 4593465 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Exchange Server 2019 Cumulative Update 7 | 4593465 (Security Update) |
Important | Information Disclosure | Maybe |
Patches
2 patches
| Article | Type | Restart |
|---|---|---|
4593466 |
Security Update | Maybe |
4593465 |
Security Update | Maybe |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Steven Seeley (mr_me) of Source Incite
References
On This Page