What is CVE-2017-0263?

CVE-2017-0263 is a high-severity vulnerability in Microsoft Windows 10 1507, classified under Use After Free. CVSS score: 7.8/10. Published 2017-05-12.

How severe is CVE-2017-0263?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2017-0263 known to be exploited?

Yes. CVE-2017-0263 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-10), indicating it is being actively exploited. 14 public proof-of-concept repositories are indexed.

Use After Free in Microsoft Windows 10 1507

CVE-2017-0263

The kernel-mode drivers in Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability."

Vulnerability class: Use-After-Free

Published 2017-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.100 (95.6th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.100 · newest: 0.100 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-02-10. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-08-10.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0263 (Patch, Vendor Advisory)
www.securitytracker.com/id/1038449 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.securityfocus.com/bid/98258 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
xiaodaozhi.com/exploit/117.html (Exploit, Third Party Advisory)
www.exploit-db.com/exploits/44478/ (Exploit, VDB Entry, Third Party Advisory, exploit)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-0263?: CVE-2017-0263 is a high-severity vulnerability in Microsoft Windows 10 1507, classified under Use After Free. CVSS score: 7.8/10. Published 2017-05-12.
How severe is CVE-2017-0263?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2017-0263 known to be exploited?: Yes. CVE-2017-0263 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-10), indicating it is being actively exploited. 14 public proof-of-concept repositories are indexed.