SB20260928132 - Reachable assertion in FreeRDP

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Main Vulnerability Database SB20260928132

SB20260928132 - Reachable assertion in FreeRDP

Published: September 28, 2026

Security Bulletin ID SB20260928132
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Reachable assertion (CVE-ID: N/A)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a reachable assertion in the urb_isoch_transfer IN transfer path when processing a malicious RDP server's USB redirection request with an oversized OutputBufferSize value. A remote attacker can send a crafted TS_URB_ISOCH_TRANSFER request to cause a denial of service.

Exploitation requires the USB redirection channel (URBDRC) and no user interaction beyond connecting to the server.


Remediation

Install update from vendor's website.

References