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CVE-2023-36745

71
FAUCET Score

CVE-2023-36745 is a critical Remote Code Execution vulnerability affecting Microsoft Exchange Server. With a CVSS score of 8.0 (HIGH), it allows an authenticated attacker on an adjacent network to execute arbitrary code with high impact on confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog and lacking public exploit code, its high EPSS score and significant community discussion indicate a strong potential for future exploitation. Media reports highlight over 20,000 vulnerable Exchange servers, underscoring the urgency for patching.

Impacted Technologies

VendorProductVersion(s)CPE
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_12:*:*:*:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_13:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.0HIGH

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.1
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
81.14%
Probability of exploitation in next 30 days
EPSS Percentile
99.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.8114 is in the 99th percentile among its peer group of 554 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2019 Cumulative Update 13Fixed in: 15.02.1258.025
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2019 Cumulative Update 12Fixed in: 15.02.1118.037
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2016 Cumulative Update 23Fixed in: 15.01.2507.032
View patch

Vendor Advisories (1)

microsoft2023-Sep/CVE-2023-36745Important

Microsoft Exchange Server Remote Code Execution Vulnerability

Sep 12, 2023

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2023-36745
PatchVendor Advisory