How severe is CVE-2019-1064?

CVE-2019-1064 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which products are affected by CVE-2019-1064?

CVE-2019-1064 affects the following products: microsoft windows 10 1607, microsoft windows 10 1703, microsoft windows 10 1709, microsoft windows 10 1803, microsoft windows 10 1809, microsoft windows 10 1903, microsoft windows server 1709, microsoft windows server 1803, and 3 more.

How do I patch CVE-2019-1064?

No patch has shipped for CVE-2019-1064 yet — track the microsoft windows 10 1607 advisory for a fixed release and apply the workarounds below in the meantime.

How do I detect CVE-2019-1064 across my infrastructure?

Inventory every microsoft windows 10 1607 deployment and check each version against the affected-products list above.

How do I mitigate CVE-2019-1064 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2019-1064 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2019-1064, including 5 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-2019-1064?

CVE-2019-1064 has an EPSS (Exploit Prediction Scoring System) score of 6.9%, placing it in the 94th 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. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2019-1064 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2019-1064 (Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-03-15. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-04-05. 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.

What type of vulnerability is CVE-2019-1064?

CVE-2019-1064 is classified as CWE-59 (CWE-59). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2019-1064?

CVE-2019-1064 affects microsoft windows 10 1607; microsoft windows 10 1703; microsoft windows 10 1709; microsoft windows 10 1803, and 7 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2019-1064 published, and has it been updated?

CVE-2019-1064 was published on June 12, 2019 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

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CISA KEV · ACTIVELY EXPLOITED

HIGH severity

CVE-2019-1064 — Windows 10 1607

HIGH

CVE-2019-1064 is a high-severity (CVSS 7.8) CWE-59 vulnerability in microsoft windows 10 1607. It is in CISA's Known Exploited Vulnerabilities catalog (added 2022-03-15) and has been used in ransomware campaigns — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links. An attacker who successfully exploited this vulnerability…

Published

Jun 12, 2019

Updated

Jun 17, 2026

Affected

11 products

Patched

See advisory

Exploits

7 known

Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2022-03-15 — including use in ransomware campaigns. Federal agencies were required to remediate by 2022-04-05.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2019-1064.

EPSS Exploitation Probability

via FIRST.org ↗

6.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs94th percentile — riskier than 94% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2019-1064 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could then install programs; view, change or delete data. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system. The security update addresses the vulnerability by correcting how Windows AppX Deployment Service handles hard links.

Affected Products

11 products · 21 configurations

windows 10 1607microsoft

all

windows 10 1703microsoft

all

windows 10 1709microsoft

all

windows 10 1803microsoft

all

windows 10 1809microsoft

all

windows 10 1903microsoft

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.