Microsoft Exchange Server
CVE-2019-1233 — Microsoft Exchange Denial of Service Vulnerability
Executive Summary
A denial of service vulnerability exists in Microsoft Exchange Server software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could cause a remote denial of service against a system. Exploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Exchange server. The security update addresses the vulnerability by correcting how Microsoft Exchange Server handles objects in memory.
Overview
7.5
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:N/UI:N/S:U/C:N/I:N/A:H
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
EPSS Score
0.06176
probability of exploitation in the next 30 days
0.92739 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 12 | 4515832 (Security Update) |
Important | Denial of Service | Maybe |
| Microsoft Exchange Server 2016 Cumulative Update 13 | 4515832 (Security Update) |
Important | Denial of Service | Maybe |
| Microsoft Exchange Server 2019 Cumulative Update 1 | 4515832 (Security Update) |
Important | Denial of Service | Maybe |
| Microsoft Exchange Server 2019 Cumulative Update 2 | 4515832 (Security Update) |
Important | Denial of Service | Maybe |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
4515832 |
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
References
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