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CVE-2025-55331· NVD / CVE Program· CNA microsoft

Windows PrintWorkflowUserSvc Elevation of Privilege Vulnerability

Use after free in Windows PrintWorkflowUserSvc allows an authorized attacker to elevate privileges locally.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Oct 14, 2025
Updated
Jun 17, 2026
EPSS
0.3% · 26th percentile
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Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
7.0
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
microsoftwindows 10 21h2
microsoftwindows 10 22h2
microsoftwindows 11 22h2
microsoftwindows 11 23h2
microsoftwindows 11 24h2
microsoftwindows 11 25h2
microsoftwindows server 2022
microsoftwindows server 2022 23h2
microsoftwindows server 2025

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2022before 10.0.20348.4294
  • microsoft windows server 2022 23h2before 10.0.25398.1913
  • microsoft windows server 2025before 10.0.26100.6899

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows 10 Version 21H2

    • 10.0.19044.0 and later · before 10.0.19044.6456affected

  • Microsoft Windows 10 Version 22H2

    • 10.0.19045.0 and later · before 10.0.19045.6456affected

  • Microsoft Windows 11 version 22H2

    • 10.0.22621.0 and later · before 10.0.22621.6060affected

  • Microsoft Windows 11 version 22H3

    • 10.0.22631.0 and later · before 10.0.22631.6060affected

  • Microsoft Windows 11 Version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.6060affected

  • Microsoft Windows 11 Version 24H2

    • 10.0.26100.0 and later · before 10.0.26100.6899affected

  • Microsoft Windows 11 Version 25H2

    • 10.0.26200.0 and later · before 10.0.26200.6899affected

  • Microsoft Windows Server 2022

    • 10.0.20348.0 and later · before 10.0.20348.4294affected

  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

    • 10.0.25398.0 and later · before 10.0.25398.1913affected

  • Microsoft Windows Server 2025

    • 10.0.26100.0 and later · before 10.0.26100.6899affected

  • Microsoft Windows Server 2025 (Server Core installation)

    • 10.0.26100.0 and later · before 10.0.26100.6899affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-21333Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
    64This week
  • CVE-2025-21335Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
    61This week
  • CVE-2025-21334Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
    61This week
  • CVE-2023-38186Windows Mobile Device Management Elevation of Privilege Vulnerability
    39Monitor
  • CVE-2026-42904Windows TCP/IP Elevation of Privilege Vulnerability
    38Monitor
  • CVE-2023-38148Internet Connection Sharing (ICS) Remote Code Execution Vulnerability
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Windows 10 Version 21H2 for 32-bit Systems10.0.19044.6456 · KB5066791Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems10.0.19044.6456 · KB5066791Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems10.0.19044.6456 · KB5066791Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems10.0.19045.6456 · KB5066791Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems10.0.19045.6456 · KB5066791Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems10.0.19045.6456 · KB5066791Microsoft (MSRC)
Windows 11 Version 22H2 for ARM64-based Systems10.0.22621.6060 · KB5066793Microsoft (MSRC)
Windows 11 Version 22H2 for x64-based Systems10.0.22621.6060 · KB5066793Microsoft (MSRC)
Windows 11 Version 23H2 for ARM64-based Systems10.0.22631.6060 · KB5066793Microsoft (MSRC)
Windows 11 Version 23H2 for x64-based Systems10.0.22631.6060 · KB5066793Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems10.0.26100.6899 · KB5066835Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems10.0.26100.6899 · KB5066835Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems10.0.26200.6899 · KB5066835Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems10.0.26200.6899 · KB5066835Microsoft (MSRC)
Windows Server 202210.0.20348.4294 · KB5066782Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.4294 · KB5066782Microsoft (MSRC)
Windows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.1913 · KB5066780Microsoft (MSRC)
Windows Server 202510.0.26100.6899 · KB5066835Microsoft (MSRC)
Windows Server 2025 (Server Core installation)10.0.26100.6899 · KB5066835Microsoft (MSRC)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-21334273 days apartWindows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
    61This week
  • CVE-2025-21335273 days apartWindows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
    61This week
  • CVE-2026-58626273 days apartWindows Remote Desktop Services Remote Code Execution Vulnerability
    35Monitor
  • CVE-2026-69784329 days apartWindows Hello Elevation of Privilege Vulnerability
    35Monitor
  • CVE-2025-21224273 days apartWindows Line Printer Daemon (LPD) Service Remote Code Execution Vulnerability
    33Monitor
  • CVE-2024-43574371 days apartMicrosoft Speech Application Programming Interface (SAPI) Remote Code Execution Vulnerability
    33Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records