Starting December 11, the bond's annual coupon rate will be raised to 3.6% from 2.75%, CCB said in a stock exchange filing on Wednesday.
The changes were endorsed at a general meeting of bondholders on November 15.
The bond issue was placed in December 2013, bourse data show.
Shares in CCB last traded on Wednesday when they closed at 1.49 levs on the Bulgarian Stock Exchange.
($ = 0.9201 euro)