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The network diagnostic function (ping) in the Yeahlink Ultra-elegant IP Phone SIP-T41P (firmware 66.83.0.35) allows a remote authenticated attacker to trigger OS commands or open a reverse shell via command injection.
Use CWE-78, Yealink vendor hub and Ultra-Elegant Ip Phone Sip-T41p Firmware product page to widen CVE-2018-16217 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-16218 and CVE-2018-16221 for nearby disclosures in the same product family.