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10.3(1)SR5 for Unified IP Conference Phone 8831
11.0(4)SR3 for Wireless IP Phone 8821 and 8821-EX
12.5(1)SR1 for the rest of the IP Phone 7800 and 8800 Series
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https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190320-ip-phone-rce