OpenVPN 2.x allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server.
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OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 are affected. This is fixed in version 2.6.21 and 2.7.5.
