OpenSSH Denial of Service Vulnerability through Duplicate KEXINIT Requests

CVE-2016-8858 · HIGH Severity

AV:N/AC:L/AU:N/C:N/I:N/A:C

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

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