Sysax Multi Server < 5.55 SSH Username Buffer Overflow
Priority HIGH 81CWE-121Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.
Summary
Sysax Multi Server versions prior to 5.55 contain a stack-based buffer overflow in its SSH service. When a remote attacker supplies an overly long username during authentication, the server copies the input to a fixed-size stack buffer without proper bounds checking. This allows remote code execution under the context of the service.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.04742 91st percentileScored 2026-11-07
Public exploit Yes 4 exploit referencesTagged by the CNA and NVD
Fix Fixed Multi Server (Sysax Software): 5.55
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Sysax Software | Multi Server | before 5.55 | 5.55 | Patch available | CNA |
- Multi Server VendorSysax Software Affected before 5.55 Fixed in 5.55 Patch available CNA
Remediation
- Fix · CNA Multi Server (Sysax Software) Fixed in 5.55
Timeline
- 2026-10-02 Threatist record created from CVE-2012-10060
- 2026-10-03 Alias added: GHSA-74gq-wvgf-56v7
- 2026-10-04 EPSS moved to the 90th–95th percentile
References
Exploit 4
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ssh/sysax_ssh_username.rb
- https://www.exploit-db.com/exploits/18535
- https://www.exploit-db.com/exploits/18557
- https://web.archive.org/web/20120302203344/http://www.pwnag3.com/2012/02/sysax-multi-server-ssh-username-exploit.html
Other 1
More Sysax Multi Server vulnerabilities
- TI-2013-06205 Sysax Multi-Server <= 6.10 SSHD Key Exchange DoS CVSS 4.0HIGH 8.7
- TI-2024-35807 Sysax Multi Server 6.99 is vulnerable to a denial of service (DoS) condition when… CVSS 3.1HIGH 7.5
- TI-2012-05248 Stack-based buffer overflow in Sysax Multi Server before 5.52, when HTTP is enabled… CVSS 2.0HIGH 7.1
- TI-2024-35808 Sysax Multi Server 6.99 is vulnerable to Cross Site Scripting (XSS) via the /scgi?sid parameter. CVSS 3.1MEDIUM 6.1
- TI-2023-30611 Sysax Multi Server 6.95 - 'Password' Denial of Service (PoC) CVSS 4.0MEDIUM 5.1
- TI-2009-04546 Multiple directory traversal vulnerabilities in Sysax Multi Server 4.5 allow remote… CVSS 2.0HIGH 9.0
Sources
- CVE-2012-10060 · CVE Program
- CVE-2012-10060 · NVD
- FIRST EPSS
- GHSA-74gq-wvgf-56v7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences