CVE-2025-26677Network attack vector

Unauthenticated service interruption via resource exhaustion

Published May 13, 2025 · Updated Feb 13, 2026

Uncontrolled resource consumption in Microsoft Windows Server RD Gateway allows remote attackers to interrupt the service over a network. Microsoft has not disclosed the request or code path that consumes gateway resources without limits or throttling. No authentication or user interaction is required; successful exploitation exhausts gateway resources and makes RD Gateway unavailable.

CVSS severity7.5
High
EPSS probability1.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Microsoft Windows Server RD Gateway allows remote attackers to interrupt the service over a network. Microsoft has not disclosed the request or code path that consumes gateway resources without limits or throttling. No authentication or user interaction is required; successful exploitation exhausts gateway resources and makes RD Gateway unavailable.

The record

CVE
CVE-2025-26677
Published
May 13, 2025
Updated
Feb 13, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-770, CWE-400, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.7314

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.7314
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.4061
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.8066
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1611
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.8066
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.7314
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.3692
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.4061

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
T1499.002Endpoint Denial of Service: Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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