FortressSSH SSH_MSG_KEXINIT message logging buffer overflow

fortressssh-sshmsgkexinit-bo (26498) The risk level is classified as HighHigh Risk


FortressSSH is vulnerable to a stack-based buffer overflow, caused by improper bounds checking when SSH_MSG_KEXINIT messages are logged. By sending a specially-crafted SSH_MSG_KEXINIT message from a malicious SSH client, a remote attacker could overflow a buffer and execute arbitrary code on the system.


Gain Access


No remedy available as of September 1, 2014.


  • Pragma Systems, Inc. Web site: Pragma FortressSSH.
  • BID-17991: Pragma FortressSSH SSH_MSG_KEXINIT Remote Buffer Overflow Vulnerability
  • CVE-2006-2421: Stack-based buffer overflow in Pragma FortressSSH allows remote attackers to execute arbitrary code via long SSH_MSG_KEXINIT messages, which may cause an overflow when being logged. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
  • OSVDB ID: 25535: FortressSSH SSH_MSG_KEXINIT Logging Remote Overflow
  • SA20114: FortressSSH SSH_MSG_KEXINIT Logging Buffer Overflow

Platforms Affected:

  • Pragma Systems FortressSSH and prior


May 16, 2006

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