NULL pointer dereference in FreeRDP - #VU137823
Published: July 16, 2026
Vulnerability identifier: #VU137823
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-476
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.
The vulnerability exists due to a null pointer dereference in smartcard emulation cache handling when processing peer-controlled SCARD_IOCTL_READCACHEA or SCARD_IOCTL_WRITECACHEA requests with a null lookup-name pointer. A remote attacker can send a specially crafted smartcard cache request to cause a denial of service.
Smartcard redirection or smartcard emulation must be enabled, and the request must include a valid CardIdentifier.
Remediation
Install security update from vendor's website.