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CVE-2025-59249

27
FAUCET Score

CVE-2025-59249 describes a critical weak authentication vulnerability in Microsoft Exchange Server, allowing an authorized attacker to elevate privileges over a network. With a CVSS score of 8.8 (HIGH), this flaw is easily exploitable remotely with low complexity and no user interaction, leading to high impact on confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog or having public exploit code, its high FAUCET Risk Score of 83/100 and significant media coverage (2 articles) indicate a notable concern within the cybersecurity community. Although community discussion is limited, the potential for severe impact necessitates prompt patching.

Impacted Technologies

VendorProductVersion(s)CPE
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.77%
Probability of exploitation in next 30 days
EPSS Percentile
51.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0077 is in the 45th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2016 Cumulative Update 23Fixed in: 15.01.2507.061
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2019 Cumulative Update 14Fixed in: 15.02.1544.036
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2019 Cumulative Update 15Fixed in: 15.02.1748.039
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server Subscription Edition RTMFixed in: 15.02.2562.029
View patch
microsoftvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

microsoft2025-Oct/CVE-2025-59249Important

Microsoft Exchange Server Elevation of Privilege Vulnerability

Oct 14, 2025

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2025-59249
Vendor Advisory