cvsbug: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/cvsbug - from package: cvs

You may install the required package with command yum install {package}
Error in other languages:
cvsbug: bevel nie gevind nie
cvsbug: comandă negăsită
cvsbug: comando não encontrado
cvsbug: commande introuvable
cvsbug: command not found
cvsbug: käsku ei ole
cvsbug: không tìm thấy lệnh
cvsbug: komanda nerasta
cvsbug: Kommando nicht gefunden.
cvsbug: kommandot finns inte
cvsbug: komut yok
cvsbug: nie znaleziono polecenia
cvsbug: níor aimsíodh an t-ordú
cvsbug: no se encontró la orden
cvsbug: no s'ha trobat l'ordre
cvsbug: opdracht niet gevonden
cvsbug: parancs nem található
cvsbug: perintah tidak ditemukan
cvsbug: príkaz nenájdený
cvsbug: příkaz nenalezen
cvsbug: команда не найдена
cvsbug: командата не е открита
cvsbug: 命令找不到
cvsbug: コマンドが見つかりません