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PatchSiren cyber security CVE debrief

CVE-2026-27925 Microsoft CVE debrief

A use-after-free vulnerability exists in the Windows Universal Plug and Play (UPnP) Device Host. An unauthorized attacker could exploit this vulnerability to disclose information over an adjacent network. This vulnerability affects Windows systems, particularly those exposed to adjacent networks. Defenders should assess their exposure and prioritize patching vulnerable systems to prevent potential data disclosure. The vulnerability is due to improper handling of memory, allowing attackers to access sensitive information.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows systems, especially those exposed to adjacent networks, should assess their exposure and prioritize patching.

Why it matters

CVE-2026-27925 is a use-after-free vulnerability in Windows UPnP Device Host that allows information disclosure over adjacent networks. Defenders should prioritize patching vulnerable systems to prevent potential data exposure.

  • Information disclosure over adjacent networks
  • Potential data exposure on vulnerable systems
  • Need for patching and verification of vulnerable systems
  • Possible network reconnaissance using exploit

Technical summary

The vulnerability exists in the Windows Universal Plug and Play (UPnP) Device Host due to a use-after-free error. An unauthorized attacker could exploit this vulnerability to disclose information over an adjacent network. The vulnerability is caused by improper handling of memory, allowing attackers to access sensitive information. Defenders should prioritize patching vulnerable Windows systems, especially those exposed to adjacent networks.

Defensive priority

Defenders should prioritize patching vulnerable Windows systems, especially those exposed to adjacent networks.

Recommended defensive actions

  • Patch vulnerable Windows systems
  • Verify and apply Microsoft's security updates
  • Monitor network exposure for affected systems

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the vulnerability. The vulnerability has been publicly disclosed and defenders should verify their systems for exposure. Evidence of exploitation has not been reported, but defenders should monitor for potential attacks. The CVE record was published on 2026-04-14T16:58:13.263Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-27925 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-27925

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-27925 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-27925

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.