CVE-2026-65785: Windows DHCP Client Denial of Service Vulnerability

mediumCVSS 6.5CVE-2026-65785

Uncontrolled resource consumption in Windows DHCP Client allows an unauthorized attacker to deny service over an adjacent network.

CSIRTS triage

vendor: Microsoft product: Windows DHCP Client Denial of service

What: Uncontrolled resource consumption in Windows DHCP Client allows denial of service over an adjacent network.
Who is affected: Systems running Windows DHCP Client that receive malicious DHCP responses from the local network segment.
Urgency: Medium severity (CVSS 6.5); not currently exploited but impacts network availability on adjacent networks.
Action: Apply Windows security updates that address CVE-2026-65785 when available.

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: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65785

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-2026-657850.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-65785	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
mediumCVE-2026-65785: Uncontrolled resource consumption in Windows DHCP Client allows an unauthorized attacker to de…nvd

Recent advisories for Windows DHCP Client

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.

mediumCVE-2026-65785: Uncontrolled resource consumption in Windows DHCP Client allows an unauthorized attacker to de…nvd · 2026-08-11
highCVE-2026-62755: Stack-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate pr…nvd · 2026-08-11
highCVE-2026-62736: Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate pri…nvd · 2026-08-11
highCVE-2026-61361: Use after free in Windows DHCP Client allows an authorized attacker to execute code locally.nvd · 2026-08-11
highCVE-2026-61361: Windows DHCP Client Remote Code Execution Vulnerabilitymsrc · 2026-08-11
highCVE-2026-62736: Windows DHCP Client Elevation of Privilege Vulnerabilitymsrc · 2026-08-11