Improper Input Validation Affecting libssh2 package, versions >=0.0.0

  • Attack Complexity


  • User Interaction


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  • snyk-id


  • published

    2 Oct 2019

  • disclosed

    13 Mar 2015

  • credit

    Mariusz Ziulek

How to fix?

There is no fixed version for libssh2.


libssh2 is a client-side C library implementing the SSH2 protocol.

Affected versions of this package are vulnerable to Improper Input Validation libssh2 is vulnerable to denial of service (DoS) attacks and other attacks. kex_agree_methods function in libssh2 reads incoming SSH_MSG_KEXINIT packet data without a proper range checking of length values, thereby allowing remote servers to cause a denial of service by using malicious SSH_MSG_KEXINIT packet.