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CVE-2025-21221: Windows Telephony Service Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.

Microsoft Security Response Center
#vulnerability#windows#rce#buffer_overflow#auth#Windows Telephony Service#Security Vulnerability
CVE-2025-21204: Windows Process Activation Elevation of Privilege Vulnerability

Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.

CVE-2025-21203: Windows Routing and Remote Access Service (RRAS) Information Disclosure Vulnerability

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** This attack requires an admin user on the client to connect to a malicious server and then take specific actions which could result in information disclosure.

CVE-2025-27748: Microsoft Office Remote Code Execution Vulnerability

**According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?** The word **Remote** in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. For example, when the score indicates that the **Attack Vector** is **Local** and **User Interaction** is **Required**, this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and open a specially crafted file from a website which leads to a local attack on their computer.

CVE-2025-27746: Microsoft Office Remote Code Execution Vulnerability

**According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?** The word **Remote** in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. For example, when the score indicates that the **Attack Vector** is **Local** and **User Interaction** is **Required**, this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and open a specially crafted file from a website which leads to a local attack on their computer.

CVE-2025-27744: Microsoft Office Elevation of Privilege Vulnerability

**Is the Preview Pane an attack vector for this vulnerability?** No, the Preview Pane is not an attack vector.