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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Sysax Software | Multi-Server | 6.10 |
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/ssh/sysax_sshd_kexchange.rbExploit
- https://www.mattandreko.com/2013/04/08/sysax-multi-server-6.10-ssh-dos/Exploit, Third Party Advisory
- https://www.sysax.com/Product
- https://www.vulncheck.com/advisories/sysax-multi-server-sshd-key-exchange-dosThird Party Advisory
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/ssh/sysax_sshd_kexchange.rbExploit
- https://www.mattandreko.com/2013/04/08/sysax-multi-server-6.10-ssh-dos/Exploit, Third Party Advisory
Timeline
- Published
- Aug 5, 2025
- Last modified
- Jun 16, 2026
- NVD status
- Analyzed