diff --git a/oletools/common/clsid.py b/oletools/common/clsid.py
index 4eb191a..684d158 100644
--- a/oletools/common/clsid.py
+++ b/oletools/common/clsid.py
@@ -157,6 +157,7 @@ KNOWN_CLSIDS = {
     '975797FC-4E2A-11D0-B702-00C04FD8DBF7': 'Loads ELSEXT.DLL (Known Related to CVE-2015-6128)',
     '978C9E23-D4B0-11CE-BF2D-00AA003F40D0': 'Microsoft Forms 2.0 Label (Forms.Label.1)',
     '996BF5E0-8044-4650-ADEB-0B013914E99C': 'MSCOMCTL.ListViewCtrl (may trigger CVE-2012-0158)',
+    '9C38ED61-D565-4728-AEEE-C80952F0ECDE': 'Virtual Disk Service Loader - vdsldr.exe (related to MS Office click-to-run issue CVE-2021-27058)',
     'A08A033D-1A75-4AB6-A166-EAD02F547959': 'otkloadr WRAssembly Object (can be used to bypass ASLR after triggering an exploit)',
     'B54F3741-5B07-11CF-A4B0-00AA004A55E8': 'vbscript.dll - VB Script Language (ProgID: VBS, VBScript)',
     'B801CA65-A1FC-11D0-85AD-444553540000': 'Adobe Acrobat Document - PDF file',