Denial-of-Service Vulnerability in Sysax Multi-Server SSH Daemon
CVE-2013-10065

8.7HIGH

Key Information:

Vendor

Sysax Software

Status
Multi-server
Vendor
CVE Published:
5 August 2025

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 48%

What is CVE-2013-10065?

A significant denial-of-service vulnerability affects Sysax Multi-Server version 6.10 via its SSH daemon. An attacker can exploit this flaw with a specially crafted SSH key exchange packet, which includes a non-standard byte in place of the expected delimiter. This malformed data can prompt the service to crash, resulting in a loss of availability. Properly handling key exchange data is crucial for maintaining uptime and service reliability.

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Affected Version(s)

Multi-Server 6.10

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2013-10065 - Proof of Concept

CVE-2013-10065 - Proof of Concept

References

https://www.mattandreko.com/2013/04/08/sysax-multi-server...
technical-descriptionexploit
https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit
https://www.sysax.com/
product

EPSS Score

48% chance of being exploited in the next 30 days.

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Matt "hostess" Andreko
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