# CVE-2009-20005

## Summary

- **CVE ID:** CVE-2009-20005
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (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)
- **CWE:** CWE-121
- **Published:** Sep 16, 2025
- **Last Modified:** May 15, 2026

## Description

A stack-based buffer overflow exists in the UtilConfigHome.csp endpoint of InterSystems Caché 2009.1. The vulnerability is triggered by sending a specially crafted HTTP GET request containing an oversized argument to the .csp handler. Due to insufficient bounds checking, the input overflows a stack buffer, allowing an attacker to overwrite control structures and execute arbitrary code. It is unknown if this vulnerability was patched and an affected version range remains undefined.

## Affected Products

- InterSystems Corporation — InterSystems Caché (*)
- InterSystems Corporation — InterSystems Caché (0)

## References

- [CNA](https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/intersystems_cache.rb)
- [CNA](https://www.exploit-db.com/exploits/16807)
- [CNA](https://www.juniper.net/us/en/threatlabs/ips-signatures/detail.APP:INTERSYSTEMS-CACHE-OF.html)
- [CNA](https://www.intersystems.com/products/cache/)
- [CNA](https://www.vulncheck.com/advisories/intersystems-cache-stack-buffer-overflow)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 69.35%
- **EPSS Percentile:** 98.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._