How severe is CVE-2009-0609?

CVE-2009-0609 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2009-0609 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0609?

CVE-2009-0609 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-2009-0609?

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-2009-0609 published?

CVE-2009-0609 was published on 2009-02-17 and last updated on 2026-06-16.

CVE-2009-0609

CVE-2009-0609 is a high-severity vulnerability in Sun Java System Directory Server with a CVSS 2.0 base score of 7.8. 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-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Sun Java System Directory Server
Published: 2009-02-17
Last modified: 2026-06-16

Description

Sun Java System Directory Proxy Server in Sun Java System Directory Server Enterprise Edition 6.0 through 6.3, when a JDBC data source is used, does not properly handle (1) a long value in an ADD or (2) long string attributes, which allows remote attackers to cause a denial of service (JDBC backend outage) via crafted LDAP requests.

Frequently asked questions

What is CVE-2009-0609?: Sun Java System Directory Proxy Server in Sun Java System Directory Server Enterprise Edition 6.0 through 6.3, when a JDBC data source is used, does not properly handle (1) a long value in an ADD or (2) long string attributes, which allows remote attackers to cause a denial of service (JDBC backend outage) via crafted LDAP requests.
How severe is CVE-2009-0609?: CVE-2009-0609 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2009-0609 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0609?: CVE-2009-0609 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-2009-0609?: 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-2009-0609 published?: CVE-2009-0609 was published on 2009-02-17 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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