Description

Heap-based buffer overflow in RPC Runtime allows an unauthorized attacker to execute code over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.1",
  "pubDate": "2026-08-11T17:18:31.413Z",
  "pubdate": "2026-08-11T17:18:31.413Z",
  "executiveSummary": "This vulnerability is a heap-based buffer overflow residing within the RPC Runtime. The flaw allows an unauthorized, remote attacker to achieve arbitrary code execution over a network. The affected system is the RPC Runtime, which processes remote procedure calls across distributed environments. The risk implications are severe, as successful exploitation compromises the confidentiality, integrity, and availability of the underlying host system, potentially enabling complete system takeover. The attacker capabilities include unauthenticated remote exploitation over the network, requiring no prior access or user interaction. Given the exposure of RPC services in enterprise and network environments, this vulnerability presents a critical risk that demands immediate remediation.",
  "technicalDetails": "The vulnerability is a classic heap-based buffer overflow stemming from improper bounds checking within the RPC Runtime component. The root cause lies in how the RPC Runtime handles incoming data packets or parameter allocations during remote procedure call processing. When the vulnerable component parses maliciously crafted input fields, it fails to validate the size of the incoming data against the pre-allocated heap buffer dimensions. This memory safety violation allows an attacker to write past the boundaries of the heap buffer.\nExploitation occurs via the network protocol utilized by the RPC Runtime. An unauthorized attacker constructs a specialized malicious payload designed to overflow the target heap buffer with controlled data. As the RPC Runtime processes the oversized request, the excessive data spills over into adjacent memory regions on the heap. By carefully crafting the payload, the attacker can overwrite critical heap metadata, function pointers, or application data structures.\nThe attack flow proceeds as follows: First, the attacker initiates a network connection to the exposed RPC service port. Second, the attacker transmits the maliciously crafted RPC request containing the buffer-over-allocating payload. Third, the RPC Runtime receives and parses the request, triggering the unsafe memory copy operation into the heap buffer. Fourth, the overflow corrupts adjacent heap chunks or pointer references. Finally, when the application attempts to execute corrupted function pointers or process the manipulated heap structures, control flow is hijacked, enabling the execution of arbitrary machine code supplied within the payload.\nThe vulnerable component is the RPC Runtime data parsing and memory management subsystem. Exploitation requires network connectivity to the target service. Authentication is not required, and the attacker does not need prior privileges on the target system. Post-exploitation impact includes full code execution within the security context of the RPC service, which typically runs with elevated privileges, allowing the attacker to install malware, pivot deeper into the internal network, or exfiltrate sensitive data."
}