How severe is CVE-2019-4539?

CVE-2019-4539 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2019-4539 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-4539?

CVE-2019-4539 affects Ibm Security Directory Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-4539?

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-2019-4539 published?

CVE-2019-4539 was published on 2019-10-02 and last updated on 2026-06-17.

CVE-2019-4539

CVE-2019-4539 is a high-severity vulnerability in Ibm Security Directory Server with a CVSS 3.x base score of 7.1. 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-91.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 5.5
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-91
Affected product: Ibm Security Directory Server
Published: 2019-10-02
Last modified: 2026-06-17

Description

IBM Security Directory Server 6.4.0 does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. IBM X-Force ID: 165812.

Frequently asked questions

What is CVE-2019-4539?: IBM Security Directory Server 6.4.0 does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. IBM X-Force ID: 165812.
How severe is CVE-2019-4539?: CVE-2019-4539 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2019-4539 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-4539?: CVE-2019-4539 affects Ibm Security Directory Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-4539?: 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-2019-4539 published?: CVE-2019-4539 was published on 2019-10-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ibm:security_directory_server:6.4.0:*:*:*:*:*:*:*

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Other CWE-91 (XML Injection) vulnerabilities

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CVE-2020-29128 — Critical (CVSS 9.8): petl before 1.68, in some configurations, allows resolution of entities in an XML document.
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