FreeRDP before 3.28.0 (affected <=3.27.1) contains a heap-based buffer overflow in crypto_rsa_common() (libfreerdp/crypto/crypto.c). The function writes the modular-exponentiation result into the caller's output buffer via BN_bn2bin() and only afterward checks output_length > out_length, so out-of-bounds bytes are written before the bounds check. On the server side, when a client selects RDP Standard Security, the encrypted client random is decrypted into a fixed 32-byte buffer. Because the server publishes its RSA public key, an unauthenticated attacker can forge a ciphertext whose decrypted value is up to the full modulus length (e.g. 256 bytes for RSA-2048), overflowing the 32-byte heap buffer by up to ~224 attacker-controlled bytes pre-authentication, resulting in denial of service.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-54486 advisory.

    [2:3.10.3-12.8]
    - Backport several CVE fixes (CVE-2026-64620, CVE-2026-64621, CVE-2026-64624,       CVE-2026-67289, CVE-2026-67299, CVE-2026-68580)       Resolves: RHEL-212621, RHEL-212978, RHEL-213168, RHEL-222783, RHEL-222983,       Resolves: RHEL-223604

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:54486 advisory.

    * FreeRDP: FreeRDP: Remote code execution or denial of service via heap-based buffer overflow     (CVE-2026-64620)

    * FreeRDP: FreeRDP: Double-free vulnerability via crafted .rdp file leading to potential remote code     execution (CVE-2026-64621)

    * FreeRDP: FreeRDP: Arbitrary code execution via malicious RDP files (CVE-2026-64624)

    * FreeRDP: FreeRDP: Denial of Service via crafted WindowIcon async message (CVE-2026-67299)

    * FreeRDP: FreeRDP: HTTP Proxy Request Injection via Redirection (CVE-2026-67289)

    * FreeRDP: FreeRDP: Remote code execution or denial of service via audio input integer overflow     (CVE-2026-68580)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:54486 advisory.

    FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license.
    The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

    Security Fix(es):

    * FreeRDP: FreeRDP: Remote code execution or denial of service via heap-based buffer overflow     (CVE-2026-64620)

    * FreeRDP: FreeRDP: Double-free vulnerability via crafted .rdp file leading to potential remote code     execution (CVE-2026-64621)

    * FreeRDP: FreeRDP: Arbitrary code execution via malicious RDP files (CVE-2026-64624)

    * FreeRDP: FreeRDP: Denial of Service via crafted WindowIcon async message (CVE-2026-67299)

    * FreeRDP: FreeRDP: HTTP Proxy Request Injection via Redirection (CVE-2026-67289)

    * FreeRDP: FreeRDP: Remote code execution or denial of service via audio input integer overflow     (CVE-2026-68580)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - FreeRDP before 3.28.0 (affected <=3.27.1) contains a heap-based buffer overflow in crypto_rsa_common()     (libfreerdp/crypto/crypto.c). The function writes the modular-exponentiation result into the caller's     output buffer via BN_bn2bin() and only afterward checks output_length > out_length, so out-of-bounds bytes     are written before the bounds check. On the server side, when a client selects RDP Standard Security, the     encrypted client random is decrypted into a fixed 32-byte buffer. Because the server publishes its RSA     public key, an unauthenticated attacker can forge a ciphertext whose decrypted value is up to the full     modulus length (e.g. 256 bytes for RSA-2048), overflowing the 32-byte heap buffer by up to ~224 attacker-     controlled bytes pre-authentication, resulting in denial of service. (CVE-2026-64620)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
335268	Oracle Linux 10 : freerdp (ELSA-2026-54486)	Nessus	Oracle Linux Local Security Checks	Local	critical
335240	RockyLinux 10 : freerdp (RLSA-2026:54486)	Nessus	Rocky Linux Local Security Checks	Local	critical
335175	RHEL 10 : freerdp (RHSA-2026:54486)	Nessus	Red Hat Local Security Checks	Local	critical
328342	Linux Distros Unpatched Vulnerability : CVE-2026-64620	Nessus	Misc.	Local	critical

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CVE-2026-64620

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