Asterisk running chan_pjsip suffers from a SUBSCRIBE message stack corruption vulnerability. Vulnerable versions include 15.2.0, 13.19.0, 14.7.5, and 13.11.2.
7ce6eb5d2b74840cec684d30e389db8a84881dd35088091f86c3e601f3984460Asterisk Project Security Advisory - When processing a SUBSCRIBE request the res_pjsip_pubsub module stores the accepted formats present in the Accept headers of the request. This code did not limit the number of headers it processed despite having a fixed limit of 32. If more than 32 Accept headers were present the code would write outside of its memory and cause a crash.
2ca83ced6bedaa74703ffe260735d9b6a5f8e6d560c01ef31601708735e0b831
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