# CVE-2009-20005: InterSystems Caché UtilConfigHome.csp Stack Buffer Overflow

> A stack buffer overflow in InterSystems Caché allows remote attackers to execute arbitrary code via a crafted HTTP GET request.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Sep 2025
- **Updated:** 15 May 2026
- **Also known as:** GHSA-3q48-rvhc-r6w6

## What is CVE-2009-20005?

CVE-2009-20005 is a critical memory corruption vulnerability in InterSystems Caché, published on 16 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2009-20005?


## How do I fix CVE-2009-20005?

No fix has been published for CVE-2009-20005 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-20005 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-20005 exists.

Public exploit code:

- InterSystems Cache UtilConfigHome.csp Argument Buffer Overflow (metasploit)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-20005 and fix it if it is affected.

What it is: CVE-2009-20005 is a critical memory corruption vulnerability in InterSystems Caché, published on 16 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-20005 exists.

Affected product: InterSystems Caché. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2009-20005/ (Markdown: https://insights.sbomify.com/CVE-2009-20005/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-20005
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-20005
- OSV: https://osv.dev/vulnerability/CVE-2009-20005

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-20005/
Summaries are generated and may contain mistakes; the official description above is the record.