How severe is CVE-2018-8453?

CVE-2018-8453 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2018-8453?

Affected package information for CVE-2018-8453 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2018-8453?

No fixed version has been published for CVE-2018-8453 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2018-8453 actively exploited in the wild?

Yes. There are 11 known exploit references for CVE-2018-8453, including 1 documented proof-of-concept exploit on Exploit-DB and 8 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2018-8453?

CVE-2018-8453 has an EPSS (Exploit Prediction Scoring System) score of 81.3%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2018-8453 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2018-8453 (Microsoft Win32k Privilege Escalation Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-01-21. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-07-21. The required action was: Apply updates per vendor instructions. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

Which products and versions are affected by CVE-2018-8453?

CVE-2018-8453 affects microsoft windows 7; microsoft windows 8.1; microsoft windows 10 1507; microsoft windows 10 1607, and 11 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2018-8453 published, and has it been updated?

CVE-2018-8453 was published on October 10, 2018 and was last updated on October 28, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-01-21 — agencies required to remediate by 2022-07-21 · Ransomware

CVE-2018-8453

HIGH

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…

Published

Oct 10, 2018

Updated

Oct 28, 2025

Affected

0 pkgs

Patched

None yet

Exploits

11 known

EPSS Exploitation Probability

via FIRST.org ↗

81.3%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

15 products · 17 configurations

windows 7microsoft

all

windows 8.1microsoft

all

windows 10 1507microsoft

all

windows 10 1607microsoft

all

windows 10 1703microsoft

all

windows 10 1709microsoft

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-47134localwindows✓ Verified

Microsoft Windows - NtUserSetWindowFNID Win32k User Callback Privilege Escalation (Metasploit)

by Metasploit · Jul 17, 2019

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2018-8453 in your stack?

O3 detects CVE-2018-8453 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

7.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Local

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

Required

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

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

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

Oct 10, 2018

First exploit

Jul 17, 2019

KEV added

Jan 21, 2022

Last updated

Oct 28, 2025

Identifiers

CVE-2018-8453

References

Advisorysecurityfocus.com Advisorysecuritytracker.com Advisorysecurityfocus.com Advisorysecuritytracker.com Fixportal.msrc.microsoft.com Fixportal.msrc.microsoft.com Exploit / PoCpacketstormsecurity.com Exploit / PoCsecurelist.com Exploit / PoCpacketstormsecurity.com Exploit / PoCsecurelist.com Webcisa.gov

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.