Microsoft Patch Tuesday for July 2025 — Snort rules and prominent vulnerabilities

Microsoft Patch Tuesday for July 2025 — Snort rules and prominent vulnerabilities

/in

Microsoft Patch Tuesday for July 2025 — Snort rules and prominent vulnerabilities

Microsoft has released its monthly security update for July 2025, which includes 132 vulnerabilities affecting a range of products, including 14 that Microsoft marked as “critical.”  

In this month’s release, Microsoft observed none of the included vulnerabilities being actively exploited in the wild. Out of 14 “critical” entries, 11 are remote code execution (RCE) vulnerabilities in Microsoft Windows services and applications including KDC Proxy service, Microsoft Office and SharePoint server. 

CVE-2025-49735 is an RCE vulnerability in Windows KDC Proxy Service (KPSSVC) given a CVSS 3.1 score of 8.1. To successfully exploit this vulnerability, an unauthenticated attacker could use a specially-crafted application to leverage a cryptographic protocol vulnerability in KPSSVC to perform RCE against the target. Microsoft has noted that this vulnerability only affects Windows servers that are configured as a Kerberos key Distribution Center (KDC) Proxy Protocol server, and domain controllers are not affected. Microsoft assessed that the attack complexity is “high,” and exploitation is “more likely.”  

CVE-2025-49704 is an RCE vulnerability in Microsoft SharePoint server given a CVSS 3.1 score of 7.7. Microsoft noted that this vulnerability in Microsoft Office SharePoint is due to improper control of generation of code (“code injection”) which would allow an authenticated attacker to execute code over a network. To exploit this vulnerability, an authenticated attacker in a network-based attack, with a minimum of Site Member permission, could execute arbitrary code remotely on the SharePoint server. Microsoft assessed that the attack complexity is “low,” and exploitation is “more likely.”  

CVE-2025-49695, CVE-2025-49696, CVE-2025-49697, CVE-2025-49698, CVE-2025-49702 and CVE-2025-49703 are RCE vulnerabilities in Microsoft Office and Microsoft Word. The vulnerabilities CVE-2025-49695 and CVE-2025-49698 are “use after free” (UAF) vulnerabilities that occur when Microsoft Office tries to access memory that has already been freed. CVE-2025-49696 is an out-of-bounds read in Microsoft Office. Microsoft assessed that for CVE-2025-49695 and CVE-2025-49696, the attack complexity is “low,” and exploitation is “more likely.” For CVE-2025-49697, CVE-2025-49698, CVE-2025-49702 and CVE-2025-49703, the attack complexity is “low,” and exploitation is “less likely.”   

CVE-2025-48822 is an RCE vulnerability in Windows Hyper-V Discrete Device Assignment (DDA) given a CVSS 3.1 score of 8.6. This vulnerability is an out-of-bounds read in Hyper-V that could allow an unauthorized attacker to execute code locally. Microsoft assessed that the attack complexity is “low,” and exploitation is “less likely.” 

CVE-2025-47981is an RCE vulnerability in SPNEGO Extended Negotiation (NEGOEX) Security Mechanism given a CVSS 3.1 score of 9.8. This vulnerability is a heap-based buffer overflow that could allow an unauthorized attacker to execute code over a network. According to Microsoft, this vulnerability affects Windows client machines running Windows 10, version 1607 and above, due to the following GPO being enabled by default on these operating systems: “Network security: Allow PKU2U authentication requests to this computer to use online identities.” Microsoft has assessed that the attack complexity is “low,” and exploitation is “more likely.”  

CVE-2025-49717 is an RCE vulnerability in Microsoft SQL Server, given a CVSS 3.1 score of 8.5. This vulnerability is a heap-based buffer overflow that could allow an unauthorized attacker to execute code over a network. However, Microsoft has assessed “exploitation unlikely”. 

The last critical vulnerability listed (CVE-2025-47980) is an information disclosure in Windows Imaging Component that, if exploited, could allow an attacker to read small portions of heap memory. Microsoft has assessed that the attack complexity is “low,” and exploitation is “less likely.”   

Talos would also like to highlight the following “important” vulnerabilities as Microsoft has determined that their exploitation is “more likely:”  

  • CVE-2025-49701: Microsoft SharePoint Remote Code Execution Vulnerability 
  • CVE-2025-49724: Windows Connected Devices Platform Service Remote Code Execution Vulnerability 

A complete list of all the other vulnerabilities Microsoft disclosed this month is available on its update page.   

In response to these vulnerability disclosures, Talos is releasing a new Snort ruleset that detects attempts to exploit some of them. Please note that additional rules may be released at a future date, and current rules are subject to change pending additional information. Cisco Security Firewall customers should use the latest update to their ruleset by updating their SRU. Open-source Snort Subscriber Ruleset customers can stay up to date by downloading the latest rule pack available for purchase on Snort.org.   

Snort 2 rules included in this release that protect against the exploitation of many of these vulnerabilities are: 64435, 64436, 65092, 65096 – 65107, 65110 – 65113.  

The following Snort 3 rules are also available: 301114, 301268 – 301272. 

Cisco Talos Blog – ​Read More