Description

Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-11T17:18:14.923Z",
  "pubdate": "2026-08-11T17:18:14.923Z",
  "executiveSummary": "An out-of-bounds read vulnerability exists within the Remote Desktop Client, potentially allowing an unauthorized network-based attacker to disclose sensitive information. The flaw exposes memory contents from the affected system without requiring authentication or elevated privileges, representing a significant risk to confidentiality. Attackers can leverage network exposure to interact with the vulnerable component remotely, exploiting improper bounds checking during data processing. Successful exploitation does not inherently permit arbitrary code execution or system modification, but the unauthorized disclosure of memory contents may expose critical cryptographic materials, session data, or internal system structures that facilitate subsequent attacks. Mitigation relies on applying official vendor updates or restricting network access to vulnerable Remote Desktop Client instances.",
  "technicalDetails": "The vulnerability stems from an out-of-bounds read flaw within the memory management and packet processing routines of the Remote Desktop Client. Specifically, the vulnerable component fails to adequately validate length and boundary parameters when parsing incoming network data structures or rendering remote graphics and protocol messages. When the client processes a maliciously crafted sequence of packets, an arithmetic or indexing discrepancy allows read operations to access memory addresses outside the allocated buffer boundaries.\nThe attack flow commences when an unauthorized remote attacker establishes a network connection or intercepts communication with a vulnerable Remote Desktop Client instance. The attacker transmits specially crafted network payloads designed to trigger the boundary validation failure. Upon receiving and parsing the malicious payload, the affected parsing routines read adjacent heap or stack memory rather than restricting operations to the intended data buffer. This retrieved memory content is subsequently encapsulated and inadvertently reflected back to the attacker or exposed within client responses.\nAuthentication is not required to trigger this vulnerability, as the flaw resides in early-stage protocol parsing layers accessible prior to session establishment. The required privileges are zero, enabling any unauthorized network-based attacker capable of reaching the client to initiate the attack sequence. The network exposure is broad, contingent upon the operational context of the Remote Desktop Client and whether it connects to untrusted or compromised endpoints.\nThe post-exploitation impact is primarily characterized by unauthorized information disclosure. By extracting arbitrary out-of-bounds memory contents, the attacker can harvest sensitive data residing in adjacent memory segments, including session identifiers, authentication tokens, heap metadata, or previously processed cleartext information. While this specific vulnerability does not provide a direct vector for remote code execution, the leaked intelligence significantly reduces the security posture of the host and can be chained with other vulnerabilities to achieve more severe systemic compromise."
}