CVE-2009-4441

Directory Proxy Server (DPS) in Sun Java System Directory Server Enterprise Edition 6.0 through 6.3.1 does not enable the SO_KEEPALIVE socket option, which makes it easier for remote attackers to cause a denial of service (connection slot exhaustion) via multiple connections, aka Bug Id 6782659.

Published: 2009-12-28 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-4441 is rated Moderate Risk (49.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.48%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-4441

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.80% 2.48% +0.69%
2 2025-03-17 2.51% 1.80% -0.71%
3 2024-12-17 — 2.51% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-4441

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2009-4441

Affected software / configurations for CVE-2009-4441

Vendor Product Version Raw CPE
sun java_system_directory_server 6.0 cpe:2.3:a:sun:java_system_directory_server:6.0:*:enterprise:*:*:*:*:*
sun java_system_directory_server 6.1 cpe:2.3:a:sun:java_system_directory_server:6.1:enterprise:*:*:*:*:*:*
sun java_system_directory_server 6.2 cpe:2.3:a:sun:java_system_directory_server:6.2:enterprise:*:*:*:*:*:*
sun java_system_directory_server 6.3 cpe:2.3:a:sun:java_system_directory_server:6.3:enterprise:*:*:*:*:*:*
sun java_system_directory_server 6.3.1 cpe:2.3:a:sun:java_system_directory_server:6.3.1:enterprise:*:*:*:*:*:*

References for CVE-2009-4441

cvelogic Threat Intelligence