CVE-2025-59259

MEDIUMNVD 6.56.5—Trending — 4 sources updated this week

6.5

Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 44.8%
KEV: Not listed

Published

October 14, 2025

Last Modified

October 20, 2025

References (1)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59259

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-1287

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2025-592592025-10-14
Windows Local Session Manager (LSM) Denial of Service Vulnerability

Frequently asked(5)

What is CVE-2025-59259?

CVE-2025-59259 is a medium vulnerability published on October 14, 2025. Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.

When was CVE-2025-59259 disclosed?

CVE-2025-59259 was first published in the National Vulnerability Database on October 14, 2025, with the most recent update on October 20, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-59259 actively exploited?

CVE-2025-59259 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-59259?

CVE-2025-59259 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2025-59259?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-59259, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-59259

📅 Published

🔄 Last Modified

🔗 References (1)