For ITMS  the version of Software Update Plug-in Windows was showing the expected version as 12346 instead of 12345 for example on the SMP Console.

Idea is to obtain general idea how to find plugin GUID and replace version if required in DB directly

ITMS 8.X

1) Use the following query to find the plugin GUID of the affected plugin/plugins

select distinct vi.name, svs.pluginguid, svs.version,svs.build from smpversions svs 
join vitem vi on vi.guid = svs.pluginguid 

Note: '37D25576-7845-42A5-991C-D08D55D44414' is the usual GUID for Software Update Plug-in 

2) Execute the below query to update the correct version as mentioned in article  https://support.symantec.com/us/en/article.info4970.html

UPDATE [dbo].[SmpVersions] 

SET
[Version] = '1.2.346',
[Major] = 1,
[Minor] = 2,
[Build] = 346 
Where [PluginGuid] = '37D25576-7845-42A5-991C-D08D55D44414'