PT-2025-24857 · Microsoft · Windows Smb+1

James Forshaw + 2 · Published 2025-01-30 · Updated 2026-06-04 · CVE-2025-33073

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Microsoft Windows (affected versions not specified)

Description Improper access control in the Windows SMB Client, specifically within the mrxsmb.sys driver, allows an authorized or unauthenticated remote attacker to elevate privileges. The issue stems from weaknesses in authentication relaying, including NTLM reflection and Reflective Kerberos Relay attacks. Attackers can use authentication coercion techniques, such as forcing a request to a UNC path, to make a host connect to a malicious system. By manipulating CREDENTIAL TARGET INFORMATIONW and removing NTLM capabilities from SPNEGO to force Kerberos usage, an attacker can relay a Kerberos ticket back to the same host. This process allows the attacker to gain a session as the computer account (DOMAINMACHINE$) and ultimately escalate privileges to NT AUTHORITYSYSTEM, granting full control over the compromised device. Exploitation can occur via standard RPC and SMB services and may be triggered through social engineering or drive-by downloads.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

LPE

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BDU:2025-06677

CVE-2025-33073

OPENSUSE-SU-2026:10837-1

Affected Products

Windows

Windows Smb

References · 274

• 🔥 https://github.com/mverschu/CVE-2025-33073 · Exploit
• 🔥 https://exploit-db.com/exploits/52330 · Exploit
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-33073 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-06677 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10837-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-33073 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-33073 · Security Note
• https://osv.dev/vulnerability/CVE-2025-33073 · Vendor Advisory
• https://github.com/Pennyw0rth/NetExec · Note
• https://github.com/dirkjanm/krbrelayx · Note
• https://github.com/depthsecurity/RelayKing-Depth · Note
• https://github.com/F5Networks/terraform-azure-bigip-module · Note
• https://twitter.com/ThreeRiversISec/status/1972760459175440869 · Twitter Post
• https://twitter.com/0x534c/status/2013628481691885978 · Twitter Post