Heap-based buffer overflow in FreeRDP - #VU136920
Published: July 6, 2026
Vulnerability identifier: #VU136920
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FreeRDP
Affected software:
FreeRDP
FreeRDP
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service and potentially execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in crypto_rsa_common() when decrypting a client-supplied encrypted client random during server key establishment. A remote attacker can send a specially crafted ciphertext to cause a denial of service and potentially execute arbitrary code.
The issue is reachable pre-authentication on server-side deployments that permit RDP Standard Security, and user interaction is not required.
Remediation
Install security update from vendor's website.