How severe is CVE-2009-4440?

CVE-2009-4440 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2009-4440 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4440?

CVE-2009-4440 primarily affects Sun Java System Directory Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4440?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-4440 published?

CVE-2009-4440 was published on 2009-12-28 and last updated on 2026-06-16.

CVE-2009-4440

CVE-2009-4440 is a medium-severity vulnerability in Sun Java System Directory Server with a CVSS 2.0 base score of 6.8. 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-362.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: Sun Java System Directory Server
Published: 2009-12-28
Last modified: 2026-06-16

Description

Directory Proxy Server (DPS) in Sun Java System Directory Server Enterprise Edition 6.0 through 6.3.1 does not properly handle multiple client connections within a short time window, which allows remote attackers to hijack the backend connection of an authenticated user, and obtain the privileges of this user, by making a client connection in opportunistic circumstances, related to "long binds," aka Bug Ids 6828462 and 6823593.

Frequently asked questions

What is CVE-2009-4440?: Directory Proxy Server (DPS) in Sun Java System Directory Server Enterprise Edition 6.0 through 6.3.1 does not properly handle multiple client connections within a short time window, which allows remote attackers to hijack the backend connection of an authenticated user, and obtain the privileges of this user, by making a client connection in opportunistic circumstances, related to "long binds," aka Bug Ids 6828462 and 6823593.
How severe is CVE-2009-4440?: CVE-2009-4440 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2009-4440 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4440?: CVE-2009-4440 primarily affects Sun Java System Directory Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4440?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4440 published?: CVE-2009-4440 was published on 2009-12-28 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:sun:java_system_directory_server:6.0:*:enterprise:*:*:*:*:*
cpe:2.3:a:sun:java_system_directory_server:6.1:enterprise:*:*:*:*:*:*
cpe:2.3:a:sun:java_system_directory_server:6.2:enterprise:*:*:*:*:*:*
cpe:2.3:a:sun:java_system_directory_server:6.3:enterprise:*:*:*:*:*:*

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