How severe is CVE-2019-4538?

CVE-2019-4538 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2019-4538 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-4538?

CVE-2019-4538 affects Ibm Security Directory Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-4538?

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-2019-4538 published?

CVE-2019-4538 was published on 2019-10-02 and last updated on 2026-06-17.

CVE-2019-4538

CVE-2019-4538 is a high-severity vulnerability in Ibm Security Directory Server with a CVSS 3.x base score of 8.2. 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-601.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 5.8
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Ibm Security Directory Server
Published: 2019-10-02
Last modified: 2026-06-17

Description

IBM Security Directory Server 6.4.0 could allow a remote attacker to conduct phishing attacks, using an open redirect attack. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability to spoof the URL displayed to redirect a user to a malicious Web site that would appear to be trusted. This could allow the attacker to obtain highly sensitive information or conduct further attacks against the victim. IBM X-Force ID: 165660.

Frequently asked questions

What is CVE-2019-4538?: IBM Security Directory Server 6.4.0 could allow a remote attacker to conduct phishing attacks, using an open redirect attack. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability to spoof the URL displayed to redirect a user to a malicious Web site that would appear to be trusted. This could allow the attacker to obtain highly sensitive information or conduct further attacks against the victim. IBM X-Force ID: 165660.
How severe is CVE-2019-4538?: CVE-2019-4538 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2019-4538 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-4538?: CVE-2019-4538 affects Ibm Security Directory Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-4538?: 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-2019-4538 published?: CVE-2019-4538 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:*:*:*:*:*:*:*

More vulnerabilities in Ibm Security Directory Server

CVE-2022-33164 — High (CVSS 8.7): IBM Security Directory Server 7.2.0 could allow a remote attacker to traverse directories on the system. An attacker…
CVE-2019-4540 — High (CVSS 7.5): IBM Security Directory Server 6.4.0 uses weaker than expected cryptographic algorithms that could allow an attacker to…
CVE-2019-4520 — High (CVSS 7.5): IBM Security Directory Server 6.4.0 uses an inadequate account lockout setting that could allow a remote attacker to…
CVE-2015-1977 — High (CVSS 7.5): Directory traversal vulnerability in the Web Administration tool in IBM Tivoli Directory Server (ITDS) before…
CVE-2019-4541 — High (CVSS 7.2): IBM Security Directory Server 6.4.0 uses incomplete blacklisting for input validation which allows attackers to bypass…
CVE-2019-4539 — High (CVSS 7.1): IBM Security Directory Server 6.4.0 does not properly neutralize special elements that are used in XML, allowing…

All CVEs affecting Ibm Security Directory Server →

Other CWE-601 (Open Redirect) vulnerabilities

CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
CVE-2019-25282 — Critical (CVSS 9.8): V-SOL GPON/EPON OLT Platform v2.03 contains an open redirect vulnerability in the script that allows attackers to…
CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

Browse all CWE-601 (Open Redirect) vulnerabilities →