CVE-2023-35317 — Windows Server Update Service (WSUS) Elevation of Privilege Vulnerability

Executive Summary

None

Overview

7.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Weakness CWE-502: Deserialization of Untrusted Data

Released Jul 11 2023

Last Updated Jul 11 2023

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.01763 — 0.76042 percentile

NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.8

EPSS Score

0.01763

probability of exploitation in the next 30 days

0.76042 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

6 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2012 5028232 (Monthly Rollup) 5028233 (Security Only) Important Elevation of Privilege 5027283 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.24374 Yes None Windows Server 2012 (Server Core installation) 5028232 (Monthly Rollup) 5028233 (Security Only) Important Elevation of Privilege 5027283 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.24374 Yes None Windows Server 2012 R2 5028228 (Monthly Rollup) 5028223 (Security Only) Important Elevation of Privilege 5027271 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.21063 6.3.9600.21075 Yes None Windows Server 2012 R2 (Server Core installation) 5028228 (Monthly Rollup) 5028223 (Security Only) Important Elevation of Privilege 5027271 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.21063 6.3.9600.21075 Yes None Windows Server 2016	`5028169 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2016 (Server Core installation)	`5028169 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2019	`5028168 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2019 (Server Core installation)	`5028168 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2022	`5028171 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2022 (Server Core installation)	`5028171 (Security Update)`	Important	Elevation of Privilege	Yes

Patches

3 patches

Article	Type	Restart
`5028169`	Security Update	Yes
`5028168`	Security Update	Yes
`5028171`	Security Update	Yes

Exploits & PoC

1 public PoC

Unverified third-party code

Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.

Repository	Stars	Published	Description
M507/CVE-2025-59287-PoC	15	2025-11-16	Unauthenticated RCE PoC in Microsoft Windows Server Update Service (WSUS) - CVE-2025-59287 & CVE-2023-35317

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

l1k3beef

References

MSRC Advisory MITRE NVD