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CVE-2018-8639

Exploited in the wild. In CISA KEV since 2025‑03‑03. A vendor fix is available.

CVSS 3.17.8HighEPSS percentile98th22% chance in 30 daysCISA KEVListedsince 2025-03-03, due 2025-03-24
No public exploit knownFixVendor fixNo build named by the sources

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

  • Microsoft Windows 7Affected: 32-bit Systems Service Pack 1Upgrade to: not statedAffected: x64-based Systems Service Pack 1Upgrade to: not statedStated by: CVE record
  • Microsoft Windows Server 2012 R2Affected: (Server Core installation)Upgrade to: not statedStated by: CVE record
  • Microsoft Windows RT 8.1Affected: Windows RT 8.1Upgrade to: not statedStated by: CVE record
  • Microsoft Windows Server 2008Affected: 32-bit Systems Service Pack 2Upgrade to: not statedAffected: 32-bit Systems Service Pack 2 (Server Core installation)Upgrade to: not statedAffected: Itanium-Based Systems Service Pack 2Upgrade to: not statedAffected: x64-based Systems Service Pack 2Upgrade to: not stated + 1 more branchStated by: CVE record
  • Microsoft Windows Server 2019Affected: (Server Core installation)Upgrade to: not statedStated by: CVE record

Versions as the sources state them. 6 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

Coverage timeline

0 publishers

  1. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened.

What it is

From the CVE record

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8641.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS98th
CISA KEV
CISA KEV

Listed as exploited in the wild since 2025-03-03.

US federal agencies must remediate by 2025-03-24.

Known use in ransomware campaigns.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

22% chance of exploitation activity in the next 30 days, which ranks it in the 98th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

6 events over 2752 days, from the signal feeds we watch.

  1. OpenVAS check added
  2. Patch availablerecord updated
  3. Added to CISA KEVransomware campaign
  4. Publishedweakness classified

Affected products

And 37 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

Sources

References in the record

And 2 more references. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Windows 7 Service Pack 1, not every advisory. This one: actively exploited.