VDB-345009 · CVE-2026-23948 · GHSA-6f3c-qvqq-2px5

FreeRDP up to 3.21.x rdp_write_logon_info_v2 null pointer dereference

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6.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in FreeRDP up to 3.21.x. It has been rated as problematic. Impacted is the function rdp_write_logon_info_v2. Performing a manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2026-23948. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in FreeRDP up to 3.21.x. This affects the function rdp_write_logon_info_v2. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.22.0, a NULL pointer dereference vulnerability in rdp_write_logon_info_v2() allows a malicious RDP server to crash FreeRDP proxy by sending a specially crafted LogonInfoV2 PDU with cbDomain=0 or cbUserName=0. This vulnerability is fixed in 3.22.0.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-23948 since 01/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 298455 (Linux Distros Unpatched Vulnerability : CVE-2026-23948), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.22.0 eliminates this vulnerability. Applying the patch 4d44e3c097656a8b9ec696353647b0888ca45860 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (298455) and CERT Bund (WID-SEC-2026-0244). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
SUSE openSUSE
RESF Rocky Linux
Open Source FreeRDP

Productinfo

Type

Remote Access Software

Name

FreeRDP

Version

License

open-source

Website

Product: https://github.com/FreeRDP/FreeRDP/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 298455
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23948

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreeRDP 3.22.0
Patch: 4d44e3c097656a8b9ec696353647b0888ca45860

Timelineinfo

01/19/2026 CVE reserved
02/09/2026 +21 days Advisory disclosed
02/09/2026 +0 days VulDB entry created
02/25/2026 +16 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-6f3c-qvqq-2px5
Status: Confirmed

CVE: CVE-2026-23948 (🔒)
GCVE (CVE): GCVE-0-2026-23948
GCVE (VulDB): GCVE-100-345009
CERT Bund: WID-SEC-2026-0244 - FreeRDP: Mehrere Schwachstellen

Entryinfo

Created: 02/09/2026 21:12
Updated: 02/25/2026 23:26
Changes: 02/09/2026 21:12 (70), 02/10/2026 13:41 (2), 02/11/2026 11:24 (11), 02/25/2026 23:26 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.