Mark Cuban -- BLASTS ESPN STAR ... You're an Unethical Dumbass!

Mark Cuban is PISSSSSED at an ESPN reporter -- ripping the guy for posting a story that Cuban described as, "The dumbest sh*t I've ever heard."

The man in the crosshairs is Chris Broussard -- who mainly covers the NBA for ESPN.

During the DeAndre Jordan madness last night, Broussard tweeted -- "Sources: Cuban beside himself. Driving around downtown HOUSTON begging (thru texts) Jordan's family 4 address to DeAndre's home."

Cuban saw the post this morning and clearly took exception ... firing back with the following statement:

"@Chris_Broussard that's is the dumbest sh*t Ive ever heard. If you had any ethics u would msg me and I will give u his address."

Boom.