A self-replicating program that propagates itself through a network onto other computer systems without requiring a host program or any user intervention to replicate.
Sources:
NIST SP 800-28 Version 2
under Worm
Write-Once Read Many.
Also see CD-R.
Sources:
NIST SP 800-88 Rev. 1
under WORM
A self-replicating, self-propagating, self-contained program that uses networking mechanisms to spread itself. See Malicious Code.
Sources:
CNSSI 4009-2015
NIST SP 800-12 Rev. 1
under Worm
from
CNSSI 4009
A computer program that can run independently, can propagate a complete working version of itself onto other hosts on a network, and may consume computer resources destructively.
Sources:
NIST SP 800-82r3
from
RFC 4949 - adapted