I have no idea of potential impact, but the command run on an up-to-date Windows...

I have no idea of potential impact, but the command run on an up-to-date Windows 10 system reports:

    > certutil -verifyCTL disallowed
    LastSyncTime = "9/22/2015 9:33 AM"
    [DisallowedCTL]
    ListIdentifier = "DisallowedCert_AutoUpdate_1"
    SequenceNumber = 01d065c00c3f1258
    ThisUpdate = "3/23/2015 6:21 PM"
    NextUpdate = EMPTY
    SubjectAlgorithm = 1.3.6.1.4.1.311.10.11.15, "disallowedHash"
    SignerExpiration = "9/23/2015 3:36 PM", "1.0 Days"
    WARNING = "SignerExpiration: Less than 180 Days"
    CTLEntries = 57
    The system cannot find the file specified. 0x80070002 (WIN32: 2 ERROR_FILE_NOT_FOUND) -- http://ctldl.windowsupdate.com/msdownload/update/v3/static/trustedr/en/disallowedcert.sst
    MissingCerts = 57