Gocloud S2A_WL 4.2.7.16471, S2A 4.2.7.17278, S2A 4.3.0.15815, S2A 4.3.0.17193, S3A K2P MTK 4.2.7.16528, S3A 4.3.0.16572, and ISP3000 4.3.0.17190 devices allows remote attackers to execute arbitrary OS commands via shell metacharacters in a ping operation, as demonstrated by the cgi-bin/webui/admin/tools/app_ping/diag_ping/; substring.