CVE-2025-6444 MEDIUM

CVE-2025-6444: ServiceStack GetErrorResponse Improper Input Validation NTLM Relay Vulnerability

Vendor Servicestack
Product ServiceStack
Weakness CWE-20 · Input validation
Published June 25, 2025
Last update June 25, 2025
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

ServiceStack GetErrorResponse Improper Input Validation NTLM Relay Vulnerability. This vulnerability allows remote attackers to relay NTLM credentials on affected installations of ServiceStack. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the implementation of the GetErrorResponse method. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this vulnerability to relay NTLM credentials in the context of the current user. Was ZDI-CAN-25834.

Key dates

02Disclosure timeline

June 25, 2025 CVE published
June 25, 2025 Record updated