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September 2025 Patch Tuesday: SMB Relay & Azure Entra

Fortra
03/30/2026
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and we're here to talk about the September patch Tuesday. The first thing I want to talk about today is CVE-2025-55234. It's an SMB relay attack. And the executive summary for this one definitely caught my attention. Microsoft states that they released the CVE to provide customers with audit capabilities. Now the goal of a CVE should be to define a vulnerability, not to announce new configuration features. I'm really hoping that Microsoft clarifies the statement, otherwise I wonder if this CVE should even exist. After all, SMB relay attacks are nothing new. A bit of a warning for anyone running the Microsoft High Performance Compute Pack or the HPC Pack. There was a single critical CVSS score vulnerability this month, and it was for CVE-2025-55232, which is a vulnerability in the HPC Pack. The vulnerability allows for unauthenticated remote code execution. Hopefully that risk will be offset by the fact that not everyone runs this software, and that's likely one of the reasons why Microsoft has indicated that exploitation is less likely for this vulnerability. Finally, just for awareness this month, I think it's worth mentioning CVE-2025-55241. It was an elevation of privilege in Azure Entra. Now this is a no privileges required privilege escalation, which is somewhat interesting, but there's no action to take on your part. The only reason I'm mentioning it is because Azure Entra is such a critical component in environments, and it's something that you might want to talk to Microsoft about just to find out a bit more about how this vulnerability was discovered, or to find out if it had ever been exploited in the past in your environment. I doubt that's the case, given they didn't say anything, but it's always worth double checking. Once again, I'm Tyler Reguli, and this has been your September Patch Tuesday Update. Thank you, and have a great day.

TL;DR

  • CVE-2025-55234 is an SMB relay attack that Microsoft released to provide audit capabilities, raising questions about whether it should be classified as a CVE since SMB relay attacks are not new.
  • CVE-2025-55232 is a critical unauthenticated remote code execution vulnerability in Microsoft HPC Pack, though exploitation is considered less likely due to limited deployment of the software.
  • CVE-2025-55241 is a no-privileges-required privilege escalation in Azure Entra that has been automatically patched, but organizations should verify if their environments were affected given Entra's critical role.

Summary

Tyler Reguly, Associate Director of Security R&D at Fortra, provides a focused analysis of September 2025's Microsoft Patch Tuesday release, highlighting three vulnerabilities that warrant attention from IT and security teams. The briefing examines CVE-2025-55234, an SMB relay attack that Microsoft released primarily for audit capabilities rather than as a traditional vulnerability disclosure—a decision that raises questions about CVE assignment practices. Reguly also covers CVE-2025-55232, a critical unauthenticated remote code execution vulnerability in Microsoft's High Performance Compute Pack, and CVE-2025-55241, a privilege escalation issue in Azure Entra that requires no user privileges. While the Azure Entra vulnerability has been patched automatically by Microsoft, Reguly recommends organizations verify whether their environments were affected. This concise update helps administrators prioritize patching efforts and understand the strategic implications of Microsoft's security communications.

Chapters

0:00 - Introduction
0:09 - CVE-2025-55234: SMB Relay
0:40 - CVE-2025-55232: HPC Pack RCE
1:15 - CVE-2025-55241: Azure Entra Escalation

Key Quotes

0:18 "Microsoft states that they released the CVE to provide customers with audit capabilities. Now the goal of a CVE should be to define a vulnerability, not to announce new configuration features."
0:54 "The vulnerability allows for unauthenticated remote code execution. Hopefully that risk will be offset by the fact that not everyone runs this software, and that's likely one of the reasons why Microsoft has indicated that exploitation is less likely for this vulnerability."
1:35 "Azure Entra is such a critical component in environments, and it's something that you might want to talk to Microsoft about just to find out a bit more about how this vulnerability was discovered, or to find out if it had ever been exploited in the past in your environment."

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