CVE-2023-36035
HighMicrosoft Exchange Server Spoofing Vulnerability
Published Nov 15, 2023 · Updated Oct 8, 2025
Key Facts
Patch immediately- CVE-2023-36035 is a high-severity vulnerability (CVSS 8.0 v3.1) affecting Exchange Server (Microsoft), Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 12 and 1 more product.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 87% probability of exploitation in the next 30 days.
- Fixed versions are available, including Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.035, Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.040, Microsoft Exchange Server 2019 Cumulative Update 13 15.02.1258.028.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
8.0
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
87%
Higher than 99.7% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2023-36035 brief as a PDF
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Description
Microsoft Exchange Server Spoofing Vulnerability
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Exchange ServerMicrosoft | 2016-cumulative_update_23, 2019-cumulative_update_12, 2019-cumulative_update_13 | n/a |
| Microsoft Exchange Server 2016 Cumulative Update 23 | >= 15.01.0 | 15.01.2507.035 |
| Microsoft Exchange Server 2019 Cumulative Update 12 | >= 15.02.0 | 15.02.1118.040 |
| Microsoft Exchange Server 2019 Cumulative Update 13 | >= 15.02.0 | 15.02.1258.028 |
Patched Releases
Microsoft Exchange Server 2016 Cumulative Update 23
15.01.2507.035
Microsoft Exchange Server 2019 Cumulative Update 12
15.02.1118.040
Microsoft Exchange Server 2019 Cumulative Update 13
15.02.1258.028
Timeline
Publicly disclosed
Nov 15, 2023
Last updated
Oct 8, 2025
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://msrc.microsoft.com/update-guide/releaseNote/2023-Nov
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36025
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36033
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36036
- advisoryhttps://www.bleepingcomputer.com/news/microsoft/microsoft-fixes-critical-azure-cli-flaw-that-leaked-credentials-in-logs/
FAQ
Common Questions.
Microsoft Exchange Server Spoofing Vulnerability
Affected: Exchange Server (Microsoft) versions 2016-cumulative_update_23, 2019-cumulative_update_12, 2019-cumulative_update_13; Microsoft Exchange Server 2016 Cumulative Update 23 versions >= 15.01.0; Microsoft Exchange Server 2019 Cumulative Update 12 versions >= 15.02.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.035, Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.040, Microsoft Exchange Server 2019 Cumulative Update 13 15.02.1258.028.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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