CVE-2025-6444CWE-20

ServiceStack GetErrorResponse Improper Input Validation NTLM Relay Vulnerability

Medium · published June 25, 2025

CVSS v3.0
5.9
EPSS
0%
Percentile
41.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
5.9 · MEDIUM
Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00492 · 41.4th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2025-06-25T17:41Z
EPSS history
Timeline
  • 25 JUN 17:41Z
    ServiceStack GetErrorResponse Improper Input Validation NTLM Relay Vulnerability
    cvelistv5