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It was discovered that OpenVPN did not perform proper input validation
when generating a TLS key under certain configuration, which could lead to
a buffer overflow. An attacker could possibly use this issue to cause a
denial of service or execute arbitrary code. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS. (CVE-2017-12166)

Reynir Björnsson discovered that OpenVPN incorrectly handled certain
control channel messages with nonprintable characters. A remote attacker
could possibly use this issue to cause OpenVPN to consume resources, or
fill up log files with garbage, leading to a denial of service.
(CVE-2024-5594)

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