CVE-2025-47991: Windows Input Method Editor (IME) Elevation of Privilege Vulnerability
Summary:
CVE-2025-47991 is an elevation of privilege vulnerability in Microsoft Windows Input Method Editor (IME). The vulnerability is characterized as a "use after free," meaning an attacker can exploit improper memory handling within the IME. This enables a local, authenticated attacker to execute code with elevated (higher than intended) privileges.
Key Points:
- Attack Vector: Local (requires access to the targeted machine).
- Privileges: Exploitation requires the attacker to already have permission/credentials to run code on the target system.
- Vulnerability Type: Use-after-free—a memory corruption bug that can lead to the ability to run arbitrary code.
- Impact: Successful exploitation could grant the attacker SYSTEM-level access, allowing for further exploitation, persistence, or lateral movement.
- User Interaction: Not typically required (depends on the attack chain).
- Apply Microsoft Updates/Patches: Microsoft will typically release a patch or update for all affected and supported Windows versions. This is the primary and most effective mitigation method.
- Restrict Local Access: Ensure only trusted users have local access to systems, especially those on which IME is enabled.
- Monitor for Unusual Privilege Escalation Activities: Use EDR/XDR solutions to monitor for suspicious behavior, such as attempts to inject code or escalate privileges.
- As of now, you should consult the official Microsoft MSRC Security Update Guide for the most up-to-date list of affected Windows versions and available patches:
MSRC CVE-2025-47991 Official Page
What to Do Next:
- Review official security advisories and patch releases.
- Apply all available patches as soon as they are available.
- Consider restricting or disabling IME if not required in your organization/environment until patched.
Source: MSRC Security Update Guide - Microsoft Security Response Center
