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Kaspersky disclosed CVE-2025-68670, a pre-authentication remote code execution flaw in the open-source xrdp server, after finding the issue during a security audit of Kaspersky USB Redirector. The vulnerability stems from improper handling of the RDP domain field: xrdp converts client-supplied UTF-16 data to UTF-8 and then copies attacker-controlled domain input into a 256-byte stack buffer without sufficient bounds checking, creating a stack-based buffer overflow that can be triggered before authentication.
Kaspersky said it reported the bug to the xrdp maintainers in December 2025, and the project has since released fixes in xrdp 0.10.5 and backported patches to 0.9.27 and 0.10.4.1, alongside a security bulletin. The disclosure notes that while stack canaries may complicate straightforward exploitation, they are not a complete mitigation, and organizations running exposed or internally reachable xrdp services should prioritize upgrading to patched versions.
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Kaspersky published a write-up describing CVE-2025-68670 as a pre-authentication RCE in xrdp caused by unsafe conversion and copying of attacker-controlled domain data into a 256-byte stack buffer. The disclosure noted that stack canaries may complicate exploitation but are not a complete mitigation.
The xrdp maintainers fixed CVE-2025-68670 in xrdp 0.10.5, backported the patch to versions 0.9.27 and 0.10.4.1, and published a security bulletin. These updates addressed the pre-authentication buffer overflow vulnerability disclosed by Kaspersky.
Kaspersky discovered CVE-2025-68670, a pre-authentication remote code execution vulnerability in the open-source xrdp server, during a security audit of Kaspersky USB Redirector and reported it to the xrdp maintainers. The flaw stems from improper handling of the RDP domain field, leading to a stack-based buffer overflow before authentication.
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Two high-severity vulnerabilities were disclosed in **xrdp** affecting versions through `0.10.5`, exposing both remote session integrity and local privilege boundaries. **CVE-2026-32105** allows an unauthenticated attacker with man-in-the-middle capability to alter encrypted RDP traffic without detection because xrdp does not verify the MAC signature on received packets when the Classic RDP Security layer is used. The flaw does not affect deployments that enforce TLS, and administrators unable to upgrade immediately were advised to set: ```ini security_layer=tls ``` A second flaw, **CVE-2026-32107**, affects xrdp's session execution component and can let an authenticated local attacker gain **root** privileges if the privilege-drop operation fails and child processes continue executing with elevated rights. The issue requires local access and an additional exploit path, but it can lead to arbitrary code execution with full system impact. Both vulnerabilities were fixed in **xrdp `0.10.6`**, making upgrade the primary remediation for exposed servers.
Jun 29, 2026
A **critical heap-based buffer overflow** in FreeRDP affects versions through `3.27.1`, allowing an unauthenticated attacker to trigger memory corruption before authentication when **RDP Standard Security** is enabled. The flaw is in `crypto_rsa_common()` in `libfreerdp/crypto/crypto.c`, where `BN_bn2bin()` writes decrypted modular-exponentiation output into a caller-supplied buffer before verifying that the data fits, creating an out-of-bounds heap write condition. An attacker can exploit the issue by sending a crafted RSA ciphertext for the encrypted client random during the RDP handshake. Because the server exposes its RSA public key, the ciphertext can be made to decrypt to data as large as the RSA modulus length—such as `256` bytes with `RSA-2048`—while the target buffer is only `32` bytes, producing roughly `224` bytes of attacker-controlled overflow and causing denial of service. The vulnerability is tracked as **`CVE-2026-64620`**, carries a **CVSS v3.1 score of 9.8**, and is fixed in **FreeRDP `3.28.0`**.
Jul 21, 2026
Microsoft released fixes for two **Windows Remote Desktop Protocol (RDP)** information disclosure vulnerabilities, `CVE-2026-42908` and `CVE-2026-45639`, that allow a remote, unauthenticated attacker to trigger out-of-bounds reads and expose sensitive memory without user interaction. According to reporting on the June 9, 2026 security updates, `CVE-2026-42908` can disclose local memory addresses and weaken **ASLR**, while `CVE-2026-45639` can reveal process memory including credentials, session tokens, and protocol state data. Microsoft rated both flaws **Important** with **CVSS 7.5** and said exploitation was considered less likely at release, with no public exploits reported. The vulnerabilities affect a broad set of Windows platforms, including **Windows 10**, **Windows 11**, **Windows Server 2012 through 2025**, and Microsoft’s Remote Desktop client offerings for Windows desktop. The disclosures arrive amid continued scrutiny of the RDP ecosystem after earlier reports of severe Remote Desktop weaknesses, including `CVE-2025-29967` in **RD Gateway** and `CVE-2025-29966` and `CVE-2025-48817` in the **Windows Remote Desktop Client**, which were described as enabling remote code execution through heap overflow or path traversal conditions. Organizations were urged to prioritize patching internet-exposed RDP systems and strengthen access controls with VPNs, bastion hosts, strong authentication, and monitoring.
Jun 29, 2026