The npb_protocol_error function in sna V5router64 in IBM Communications Server for Windows 6.1.3 and Communications Server for AIX (aka CSAIX or CS/AIX) in sna.rte before 6.3.1.2 allows remote attackers to cause a denial of service (daemon crash) via APPC data containing a GDSID variable with a GDS length that is too small.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.