CVE-2026-49799: Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability

mediumCVSS 6.5CVE-2026-49799

Uncontrolled resource consumption in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.

CSIRTS triage

vendor: Microsoft product: Windows Denial of service

What: Uncontrolled resource consumption in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
Who is affected: Authorized attackers with access to the network.
Urgency: Remediation is medium urgency due to the potential for denial of service, but it is not currently exploited.
Action: Apply the latest security updates from Microsoft.

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: medium — CVSS 6.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49799

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.

Low exploitation riskCVE-2026-497990.79% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 53% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-49799	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

critical[NEW] [critical] Microsoft Windows products: Multiple vulnerabilitiescert-bund
unknownexploitedNCSC-2026-0231 [1.00] [M/H] Vulnerabilities fixed in Microsoft Windowsncsc-nl
mediumCVE-2026-49799: Uncontrolled resource consumption in Windows Local Security Authority Subsystem Service (LSASS…nvd