CVE-2026-23948
NULL Pointer Dereference in FreeRDP Causes Remote Crash
Publication date: 2026-02-09
Last updated on: 2026-02-10
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| freerdp | freerdp | to 3.22.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-476 | The product dereferences a pointer that it expects to be valid but is NULL. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in FreeRDP, a free implementation of the Remote Desktop Protocol. Before version 3.22.0, there is a NULL pointer dereference issue in the function rdp_write_logon_info_v2(). A malicious RDP server can exploit this by sending a specially crafted LogonInfoV2 PDU where the cbDomain or cbUserName fields are set to 0. This causes the FreeRDP proxy to crash.
How can this vulnerability impact me? :
The vulnerability can be exploited by a malicious RDP server to cause the FreeRDP proxy to crash. This denial of service can disrupt remote desktop sessions and potentially impact availability of services relying on FreeRDP.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update FreeRDP to version 3.22.0 or later, where the NULL pointer dereference issue in rdp_write_logon_info_v2() has been fixed.