Description: On Tuesday September 9, 2025, Microsoft released patches for several of its products. Analyze the CVEs and let us know which ones are most critical in your environment.
[Hint: Go to Microsoft website, export the file and analyze.].
- Without disclosing your company name, list the five most critical Risk CVEs to your environment.
- Why do you consider them critical?
- What action did you take to remediate?
America CyberSquad (ACS)
September 2025
7 Comments
1.) The five most critical Risk CVEs to my environment are: –
1. CVE-2025-55241
2. CVE-2025-54914
3. CVE-2025-53763
4. CVE-2025-53766
5. CVE-2025-501652.) Why I consider them critical: –
i.) CVE-2025-53766- This is GDI+ Remote Code Execution (RCE) Vulnerability
a.) Heap-based overflow in windows GD+ allows an unauthorized attacker to execute code over a network. Attackers craft malicious image files or fond files with manipulated headers that specify incorrect size values.
b.) An attacker doesn’t require any privileges on the systems hosting the web services. Successful exploitation of this vulnerability could cause Remote Code Execution (RCE) or Information Disclosure on web services that are parsing documents that contain a specially crafted metafile, without the involvement of a victim user.
c.) Since the attack vector is network, an attacker could trigger this vulnerability by convincing a victim to download and open a document that contains a specially crafted metafile. In the worst-case scenario, an attacker could trigger this vulnerability on web services by uploading documents containing a specially crafted metafile (AV: N) without user interaction. When multiple attack vectors can be used, we assign a score based on the scenario with the higher risk.ii.) CVE-2025-53763 Azure Databricks Elevation of Privilege Vulnerability.
Improper access control allows an unauthorized attacker to elevate privilege over a network. That is, it can be exploited remotely without requiring local access.
iii.) CVE-2025-50165 – Windows Graphics Component RCE Vulnerability.
It has a high score of 9.8. Untrusted pointer difference in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network. Attack vector is network (AV: N) The vulnerability “allows an unauthenticated attacker to remotely execute code” over a network. An attacker who successfully exploits this vulnerability could achieve remote code execution without user interaction making it highly exploitable through automated attacks.iv.) CVE-2025-54914- CVSS:3.1 10.0/8.7. (Azure Networking Elevation of Privilege Vulnerability) This is a highly severe vulnerability that enables privilege escalation with potential to compromise entire cloud environments. This means that an attacker can potentially gain administrative access to critical Azure infrastructure.
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Actions to Remediate.1.) CVE-2025-54914.
-Apply vendor patches/updates as soon as possible (First 24 Hours)
– Read the MSRC advisory and subscribe to updates.
– Immediately inventory and triage any publicly reachable networking/management endpoints.
– Restrict or block access from untrusted networks.
-Apply emergency compensating controls.
2.) CVE-2025-50165
– Patch priority triage- identify devices that host remote interactive services (RDP, Citrix/VDI brokers, terminal servers) and production servers that process unwanted graphical content.
– Apply Microsoft updates.
– Network access restrictions.
-Disable automated processing.
– Enforce least privileges.
Enhance monitoring setup.3.) CVE-2025-53763
– Apply patches and updates.
Isolate vulnerable systems if the CVE represents a critical risk.
Monitor for exploitation attempts.
Test patches in non-production1. The 5 most critical risk CVE are as follows:
📌CVE-2025-54914
📌CVE-2025-55232
📌CVE-2025-53763
📌CVE-2025-53795
📌CVE-2025-549102. Why I consider them critical
CVE-2025-54914 has a 10, per the CVSS 3:1, flagging it for the critical range. The potential risk for this CVE would be improper access control or authorization, if privilege is not properly
Handled.CVE-2025-55232 has a score of 9.8, per the CVSS. It was flagged for critical risk to the environment due to a low attack complexity and no user interaction, however, exploitation assessment rules out potential exploit by a threat actor, and by use of deserialized data or object.
CVE-2025-53763 also has a score of 9.8. The reason for it being critical is improper authorization. Inasmuch as there are no privileges requires, the attack complexity is low.
CVE-2025-53795 is at a score of 9.1 per the CVSS. The weakness for this vulnerability is in the scope of CIA, as the threat actor may have direct access to read sensitive data by reason of weak privilege functions, eventually risking access to modification of data.
CVE-2025-54910 has a score of 8.4, which is still pretty critical. What makes this critical is the weakness involved with an attacker’s access to run their code on a target asset in a vulnerable position; the Arbitrary Code Execution, which may lead to a possible subversion of any other security service
3. The action I took to remediate are as follows:
a) CVE-2025-54914
To remediate, the careful management and handling of privileges may be the outright solution. Sensitive data should be blocked from reaching outside of its trusted boundaryb)CVE-2025-55232
Employing the use of sealing features of programming language for the execution of safe deserialized data, and an example of such a feature is HASHING.c) CVE-2025-53763
By architectural design, the system must have a safe areas to prevent sensitive data from escaping. Some decisions are delicate, such as to know the appropriate time to use privileges, and when to drop them, per the least privilege principle.d)CVE-2025-53795
Using access control features in the server environment will ensure protection. No user should be able to access unauthorized functionality just by a simple access request. For this reason, it’s imperative to make sure we’d pages containing sensitive information are not cached.e) CVE-2025-54910
By performing frequent bound checks, data are safe and unable to go beyond protected and trusted boundaries. It is also important to harden the data environment by using features that make address of the data unpredictable to grant the attacker attacker void permissions.1)five most critical CVE in my environment
below is an illustrative list down from Microsoft patch Tuesday
CVE-2025 -2026Windows kernel privilege execution.
CVE-2025-2028 Microsoft exchange Remote code execution
CVE-2025-2030 Microsoft edge
CVE-2025-2031 windows print spooler remote code execution.
CVE-2025-2040 Net framework remote code execution
2. why they are critical
CVS’s>is 9.0 indicate critical suavity.
‘Remote code execution RCE) attacker can run code without local access.
. Privilege Escalation allowed attackers to gain system right
.Internet facing service exchange can be exploited externally .
‘Active Exploitation. Microsoft exploited in the wild.
3 Remediation Step is as follows
1. Patch Deployment. Download and apply the September2025 cumulative update from Microsoft.
2. Mitigation/ workarounds . for print spooler disable the service on servers printing .
3. Verification and Monitoring comfier patch installation via vulnerability scanner like Tenable, Qualys.1. Without disclosing your company name, list the five most critical Risk CVEs to your environment.
• CVE-2025-55232
• CVE-2025-54914
• CVE-2025-53763
• CVE-2025-53766
• CVE-2025-501652. Why do you consider them critical?
• CVE-2025-53766 is a heap-based buffer overflow vulnerability in Windows GDI+ that allows attackers to remotely exploit without the involvement of a victim user. This is a critical vulnerability because it affects several versions of Windows and Microsoft Office products, resulting in a significant risk to system integrity and confidentiality.• CVE-2025-55232 is critical because there is a patch for HPC Pack 2019 update 3, however there are no patches for 2016 to 2019 making HPC Pack 2019 update 2 feature vulnerable. Therefore the HPC Pack 2019 version 2 is out of service and can be easily exploited by attackers.
• CVE-2025-50165, is a high-risk remote code execution (RCE) that can allow an attacker to execute code over a network by triggering an untrusted pointer dereference in Windows’ graphics stack. This is critical because an attacker does not require user interaction to exploit the vulnerability and also, it can exploited remotely.
3. What action did you take to remediate?
• CVE-2025-53766
I will ensure that all affected systems are updated with the latest security patches provided by Microsoft. If the patches are not released yet, I will take mitigation steps such as disabling features that rely on GDI+ to reduce exposure to exploitation; implement a firewall to block suspicious traffic targeting GDI+.• CVE-2025-55232
Since there is no patches for HPC Pack 2019 version 2, I will upgrade to HPC Pack 2019 update 3 to remediate the vulnerability. I will also implement firewall rules to block access from untrusted networks.• CVE-2025-50165: I will ensure that the feature is updated if patches are released. If there are no patches, I will disable the feature temporary until a patch is released.
1. The five most critical Risk CVEs to your environment:
*CVE-2025-55232
*CVE-2025-53766
*CVE-2025-53793
*CVE-2025-50165
*CVE-2025-537922. Why I consider them critical:
*CVE-2025-55232
-An attacker who successfully exploits this vulnerability could achieve remote code execution without user interaction.*CVE-2025-53766
-An attacker doesn’t require any privileges on the systems hosting the web services. Successful exploitation of this vulnerability could cause Remote Code Execution or Information Disclosure on web services that are parsing documents that contain a specially crafted metafile, without the involvement of a victim user.
-An attacker could trigger this vulnerability by convincing a victim to download and open a document that contains a specially crafted metafile. In the worst-case scenario, an attacker could trigger this vulnerability on web services by uploading documents containing a specially crafted metafile (AV:N) without user interaction. When multiple attack vectors can be used, we assign a score based on the scenario with the higher risk*CVE-2025-53793
-System internal configuration could be disclosed by this vulnerability.*CVE-2025-50165
-An attacker who successfully exploits this vulnerability could achieve remote code execution without user interaction.*CVE-2025-53792
-An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality) but not all resources within the impacted component may be divulged to the attacker3. What action I would take to remediate:
*CVE-2025-55232
– upgrade to HPC Pack 2019 Update 3 (Build 6.3.8328) and then apply the QFE patch (Build 6.3.8352) if currently using HPC Pack 2019 Update.
– If you are currently using HPC Pack 2016, you must migrate to 2019 to receive a fix, as there is no in-place update from 2016 to 2019.*CVE-2025-53766
– Apply security update
-Apply security Patches
-Validate security patches
-Restrict user permission to limit the impact
– Disable GDI+ usage in Apps(advanced)*CVE-2025-53793
-Users can follow the instructions in the release notes to update the Azure Stack Hub environment to latest version 1.2501.1.47.*CVE-2025-50165
-Install the official Microsoft security patch that updates the OS to version 10.0.26100.4946 or later.
-If patch is not available immediately, use firewall to block access to services that might trigger the vulnerability(eg. RDP,SMB.
-Disable remote access to the graphic component if above remedies fails.*CVE-2025-53792
-Apply security patches
-Validate patch installation
-Monitor for abuse or exploitation
-Restricting network access to critical services that rely on certificate validationHi
1. The five most critical Risk CVEs to my environment.
*CVE-2025-55232
*CVE-2025-53766
*CVE-2025-53793
*CVE-2025-50165
*CVE-2025-537922.Why I consider them critical
*CVE-2025-55232: An attacker who successfully exploits this vulnerability could achieve remote code execution without user interaction.
*CVE-2025-53766:
1. An attacker doesn’t require any privileges on the systems hosting the web services. Successful exploitation of this vulnerability could cause Remote Code Execution or Information Disclosure on web services that are parsing documents that contain a specially crafted metafile, without the involvement of a victim user.
2. An attacker could trigger this vulnerability by convincing a victim to download and open a document that contains a specially crafted metafile. In the worst-case scenario, an attacker could trigger this vulnerability on web services by uploading documents containing a specially crafted metafile (AV:N) without user interaction. When multiple attack vectors can be used, we assign a score based on the scenario with the higher risk*CVE-2025-53793: System internal configuration could be disclosed by this vulnerability.
*CVE-2025-50165: An attacker who successfully exploits this vulnerability could achieve remote code execution without user interaction.
*CVE-2025-53792: An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality) but not all resources within the impacted component may be divulged to the attacker
3. Actions to remediate;
*CVE-2025-55232:
1. Upgrade to HPC Pack 2019 Update 3 (Build 6.3.8328) and then apply the QFE patch (Build 6.3.8352) if currently using HPC Pack 2019 Update
2. If you are currently using HPC Pack 2016, you must migrate to 2019 to receive a fix, as there is no in-place update from 2016 to 2019.*CVE-2025-53766:
1. Apply security update
2. Apply security Patches
3. Validate security patches
4. Restrict user permission to limit the impact
4. Disable GDI+ usage in Apps(advanced)*CVE-2025-53793: Users can follow the instructions in the release notes to update the Azure Stack Hub environment to latest version 1.2501.1.47.
*CVE-2025-50165:
1.Install the official Microsoft security patch that updates the OS to version 10.0.26100.4946 or later.
2. If patch is not available immediately, use firewall to block access to services that might trigger the vulnerability(eg. RDP,SMB)
3. Disable remote access to the graphic component if all odds fails.*CVE-2025-53792:
1. Apply security patches.
2. Validate patch installation.
3. Monitor for abuse or exploitation.
4. Restricting network access to critical services that rely on certificate validation.
