CVE-2025-26677
Published: 13 May 2025
Summary
CVE-2025-26677 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Microsoft Windows Server 2016. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 2.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-26677 is an uncontrolled resource consumption vulnerability, tracked under CWE-400 and CWE-770, that affects the Remote Desktop Gateway Service. The flaw carries a CVSS 3.1 base score of 7.5 and permits remote attackers to trigger excessive resource use without authentication or user interaction, resulting in denial of service.
An unauthenticated network attacker can send crafted requests to an exposed Remote Desktop Gateway, exhausting service resources and rendering the gateway unavailable to legitimate users while leaving confidentiality and integrity unaffected.
Microsoft’s advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26677 addresses the issue and directs administrators to apply the corresponding security update for affected Windows versions.
The associated EPSS score currently stands at 0.3591 with a recorded peak of 0.3789; no material upward trajectory from a low baseline is indicated in the available data.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-14438
Vulnerability details
Uncontrolled resource consumption in Remote Desktop Gateway Service allows an unauthorized attacker to deny service over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.
Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.
Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.
Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.
Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.
Planning and coordination of security activities (scans, tests, maintenance) directly imposes scheduling and throttling that prevents those activities from producing uncontrolled resource consumption.
Performance metrics and monitoring inherently track resource consumption patterns, making uncontrolled consumption easier to detect and mitigate.
Terminating idle connections bounds resource consumption that would otherwise allow uncontrolled accumulation of open sessions.