OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to cause a denial of service via a malformed authentication token that triggers a reachable assertion when external-auth is enabled
Exploitability
AV:NAC:HAT:PPR:LUI:PVulnerable System
VC:NVI:NVA:HSubsequent System
SC:NSI:NSA:N5.9/CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NOther