How severe is CVE-2009-2453?

CVE-2009-2453 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-2453 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2453?

CVE-2009-2453 primarily affects Citrix Presentation Server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2453?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-2453 published?

CVE-2009-2453 was published on 2009-07-14 and last updated on 2026-06-16.

CVE-2009-2453

CVE-2009-2453 is a high-severity vulnerability in Citrix Presentation Server with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Citrix Presentation Server
Published: 2009-07-14
Last modified: 2026-06-16

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.

Frequently asked questions

What is 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 Gateway Advanced Edition filters, which allows attackers to bypass intended access restrictions via unknown vectors.
How severe is CVE-2009-2453?: CVE-2009-2453 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2009-2453 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2453?: CVE-2009-2453 primarily affects Citrix Presentation Server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-2453?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2009-2453 published?: CVE-2009-2453 was published on 2009-07-14 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:citrix:presentation_server:4.5:-:se:*:*:*:*:*
cpe:2.3:a:citrix:presentation_server:4.5:-:windows_server_2003:*:*:*:*:*
cpe:2.3:a:citrix:presentation_server:4.5:-:windows_server_2003_x64:*:*:*:*:*
cpe:2.3:a:citrix:presentation_server:4.5:fp1:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:4.5:fp3:*:*:*:*:*:*

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