CVE-2026-57096: Microsoft Windows RRAS heap overflow privilege escalation

CVE-2026-57096 · Severity: high · CVSS 7.8 · Published 2026-07-14

A security vulnerability has been identified in the Windows Routing and Remote Access Service (RRAS), a component used to provide connectivity for remote users and site-to-site connections. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.

Technologies: Microsoft Windows 11, Microsoft Windows Server 2012 R2, Microsoft Windows 10. Vendors: Microsoft.

Quick answers

Is CVE-2026-57096 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-57096 being exploited in the wild.
How severe is CVE-2026-57096?
High severity, with a CVSS score of 7.8, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 Versions 24H2, 25H2, 26H1; Microsoft Windows Server 2012 R2 All installations; Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2.
Is there a fix for CVE-2026-57096?
A patch was published on 2026-07-14: Security updates released by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57096 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-57096?
Check whether you run Microsoft Windows 11, Microsoft Windows Server 2012 R2 or Microsoft Windows 10 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow vulnerability (CWE-122) exists in the Microsoft Windows Routing and Remote Access Service (RRAS). The flaw is triggered when the service improperly handles memory allocation in the heap, allowing an attacker to overwrite adjacent memory. To exploit this, an attacker must first have local access to the target system with low-level user privileges. Successful exploitation allows the attacker to execute arbitrary code with elevated system privileges. Microsoft has released security updates to address this issue across multiple versions of Windows and Windows Server.

Affected products

  • Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2
  • Microsoft Windows 11 Versions 24H2, 25H2, 26H1
  • Microsoft Windows Server 2012 R2 All installations

Timeline

  • 2026-07-14: advisory: Initial disclosure by Microsoft and NVD
  • 2026-07-14: patched: Security updates released by Microsoft

References

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