A nfs-utils bugfix update has been released for CentOS 6.

CentOS Errata and Bugfix Advisory 2020:0749

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:0749

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
d863a1dbd03ea062056599ec532283a5277623258f411e65503549425d447f5c nfs-utils-1.2.3-78.el6_10.2.i686.rpm

x86_64:
b3d0dfe3f9434b149db83e6a55194e5935c51f15b0edebf0d96a799d75c2940b nfs-utils-1.2.3-78.el6_10.2.x86_64.rpm

Source:
da792f4971e3a0b1fbfe3ce62d6323594201fd7ef2059bfbe00a3a072806fef8 nfs-utils-1.2.3-78.el6_10.2.src.rpm