How severe is CVE-2015-5378?

CVE-2015-5378 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2015-5378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-5378?

CVE-2015-5378 primarily affects Elastic Logstash. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-5378?

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-2015-5378 published?

CVE-2015-5378 was published on 2017-06-27 and last updated on 2026-06-17.

CVE-2015-5378

CVE-2015-5378 is a high-severity vulnerability in Elastic Logstash with a CVSS 3.x base score of 7.5. 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Elastic Logstash
Published: 2017-06-27
Last modified: 2026-06-17

Description

Logstash 1.5.x before 1.5.3 and 1.4.x before 1.4.4 allows remote attackers to read communications between Logstash Forwarder agent and Logstash server.

Frequently asked questions

What is CVE-2015-5378?: Logstash 1.5.x before 1.5.3 and 1.4.x before 1.4.4 allows remote attackers to read communications between Logstash Forwarder agent and Logstash server.
How severe is CVE-2015-5378?: CVE-2015-5378 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2015-5378 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-5378?: CVE-2015-5378 primarily affects Elastic Logstash. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-5378?: 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-2015-5378 published?: CVE-2015-5378 was published on 2017-06-27 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:elastic:logstash:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:elastic:logstash:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:elastic:logstash:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:elasticsearch:logstash:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:elasticsearch:logstash:1.5.0:*:*:*:*:*:*:*
cpe:2.3:a:elasticsearch:logstash:1.5.1:*:*:*:*:*:*:*
cpe:2.3:a:elasticsearch:logstash:1.5.2:*:*:*:*:*:*:*

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