Description

Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:31.763Z",
  "pubdate": "2026-08-11T17:18:31.763Z",
  "executiveSummary": "This vulnerability is a heap-based buffer overflow affecting the Windows Remote Access Connection Manager.\nThe primary impact of successful exploitation is local privilege escalation, allowing an authenticated attacker to execute arbitrary code with elevated privileges on the target system.\nThe affected product is the Windows Remote Access Connection Manager component within the Microsoft Windows operating system.\nThe risk implications are severe, as a low-privileged local user can leverage this security flaw to compromise the integrity and confidentiality of the host operating system.\nAttacker capabilities include local code execution with elevated system privileges, bypassing standard operating system access controls.\nExploitation requirements dictate that the attacker must have local access to the system and authorization to interact with the vulnerable Remote Access Connection Manager service, though no specific prior administrative privileges are mandated.",
  "technicalDetails": "The vulnerability resides in the Windows Remote Access Connection Manager, specifically within memory management routines that handle dynamic data allocations.\nThe root cause is a heap-based buffer overflow condition caused by improper boundary checks when processing input data supplied to the connection manager.\nThe vulnerable component is responsible for managing remote network connections and profile configurations within the Windows operating system architecture.\nThe attack vector is local, requiring the malicious actor to execute a specially crafted application or script on the target host to interact with the vulnerable component.\nAuthentication requirements specify that the attacker must be an authorized local user, while privilege requirements indicate the flaw can be exploited from a low privilege level to achieve escalation.\nNetwork exposure is strictly local, as the vulnerability does not inherently expose remote network attack vectors without prior local access.\nThe step-by-step exploitation method involves the attacker supplying maliciously crafted input designed to exceed the allocated heap chunk size within the Windows Remote Access Connection Manager.\nAs the input is processed, the heap buffer overflows, corrupting adjacent heap metadata and control structures.\nBy carefully manipulating the heap layout and overwriting critical function pointers or control data, the attacker redirects execution flow to injected shellcode or payload routines.\nThe payload executes in the context of the elevated process managing the connection routines, resulting in successful local privilege escalation.\nThe post-exploitation impact includes full system compromise, persistent unauthorized access, modification of system configurations, and potential pivoting within the local network environment."
}