VERTEX_BUFFER_SIZE error

[Mornedil]

So, a player on my server reported to me that he crashed with this error:

Too many verts for a dynamic vertex buffer (20000000 > 24576) Tell a programmer to up VERTEX_BUFFER_SIZE

From what I understand, that means that the maximum vertex buffer is 24576, and he crashed because vertex buffer was at 20 [B][U]million[/U][/B]?

soon after he rejoined, he crashed again.
He suspected another player did it to him, so I spectated that player.

Third time around, both me and two other players crashed with the same error.

We discussed how extreme 20 million vertices is, and how that's even possible.
I have PAC installed. Could it be possible for a player to load a custom model with 20 million vertices, which would crash the clients?
The player I spectated did not crash, but I did and people around him. When in 1st person view, you do not see your own PACs. So, could it have been him?

Edit:
I actually was kind of into writing an e2 code, but apparently around 10-15 people crashed from this error. I was in the "secret room" of gm_flatgrass, so that's probably why I didn't crash until I spectated the suspected player.