Description

Out-of-bounds write in RPC Runtime allows an unauthorized attacker to execute code over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-09-08T18:19:53.570Z",
  "pubdate": "2026-09-08T18:19:53.570Z",
  "executiveSummary": "This vulnerability is an out-of-bounds write flaw located within the RPC Runtime, posing a critical security risk to affected systems.\nThe vulnerability allows an unauthenticated, remote attacker to execute arbitrary code with the privileges of the RPC service.\nBy sending a maliciously crafted network request to the RPC Runtime, an attacker can trigger memory corruption, leading to system compromise.\nThe flaw stems from insufficient bounds checking during the processing of network packets, allowing data to be written outside of the allocated buffer boundaries.\nSuccessful exploitation results in full remote code execution, which can lead to complete system takeover, unauthorized access to sensitive data, and persistent threats within the network environment.\nGiven that the vulnerability is exploitable over a network without requiring authentication, the risk level is high, necessitating immediate prioritization of mitigation and patching efforts.",
  "technicalDetails": "The vulnerability is identified as an out-of-bounds write condition within the RPC Runtime component, specifically triggered during the deserialization or parsing of incoming RPC requests.\nRoot cause analysis indicates a failure in the input validation logic where the runtime fails to properly verify the size of user-supplied data against the allocated destination buffer.\nAn attacker initiates the attack flow by constructing a specially crafted RPC packet containing an oversized payload or malicious metadata that exceeds the anticipated length for the designated memory segment.\nWhen the RPC Runtime processes this packet, the lack of boundary enforcement allows the copying routine to overwrite adjacent memory addresses, potentially corrupting critical data structures such as function pointers, return addresses on the stack, or heap metadata.\nBy precisely controlling the content of the out-of-bounds write, an attacker can redirect the execution flow of the application to attacker-controlled memory segments, facilitating the execution of arbitrary shellcode or the instantiation of a ROP (Return-Oriented Programming) chain.\nBecause the RPC Runtime typically operates with elevated privileges, successful exploitation grants the attacker the ability to bypass standard security controls, perform lateral movement, or deploy additional payloads within the host system.\nThe vulnerability is exposed via the network protocol stack, requiring no pre-existing authentication, thereby enabling widespread remote exploitation across any system where the RPC Runtime is reachable and active.\nThe impact includes, but is not limited to, the disruption of system services, the exfiltration of sensitive information processed by the RPC mechanism, and the total subversion of host integrity."
}