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CVE-2026-45599: Windows UPnP Device Host Remote Code Execution Vulnerability

highCVSS 8.1CVE-2026-45599
Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows UPnP Device HostRemote code execution
What
Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.
Who is affected
Users of Windows UPnP Device Host.
Urgency
Remediation is urgent due to the high severity and potential for remote code execution.
Action
Install the latest security updates for Windows.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.1
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45599

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45599coverage & exploitation statusNVD · CVE.org

Recent advisories for Windows UPnP Device

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center