Microsoft Exchange Server
CVE-2026-62912 — Microsoft Exchange Server Denial of Service Vulnerability
Executive Summary
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.
Overview
6.5
CVSS MEDIUM
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:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.7
EPSS Score
0.01315
probability of exploitation in the next 30 days
0.68208 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 | 5121576 (Security Update) |
Important | Denial of Service | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 14 | 5121575 (Security Update) |
Important | Denial of Service | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 15 | 5121574 (Security Update) |
Important | Denial of Service | Yes |
| Microsoft Exchange Server Subscription Edition RTM | 5121573 (Security Update) |
Important | Denial of Service | Yes |
Patches
4 patches
| Article | Type | Restart |
|---|---|---|
5121576 |
Security Update | Yes |
5121575 |
Security Update | Yes |
5121574 |
Security Update | Yes |
5121573 |
Security Update | Yes |
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
ECooper with Aretiq.AI
References
On This Page