SNMP is a widely used protocol for monitoring the health and welfare of network equipment.
A specially crafted trap message triggers a conversion to an erroneous variable type when the -OQ option is used.
A remote attacker could possibly cause a Denial of Service condition.
There is no known workaround at this time.
All SNMP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose
">=net-analyzer/net-snmp-5.7.3_pre5-r1"