How severe is CVE-2019-11777?

CVE-2019-11777 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-2019-11777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11777?

CVE-2019-11777 affects Eclipse Paho Java Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-11777?

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-2019-11777 published?

CVE-2019-11777 was published on 2019-09-11 and last updated on 2026-06-17.

CVE-2019-11777

CVE-2019-11777 is a high-severity vulnerability in Eclipse Paho Java Client 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-346.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-346
Affected product: Eclipse Paho Java Client
Published: 2019-09-11
Last modified: 2026-06-17

Description

In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.

Frequently asked questions

What is CVE-2019-11777?: In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.
How severe is CVE-2019-11777?: CVE-2019-11777 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-2019-11777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-11777?: CVE-2019-11777 affects Eclipse Paho Java Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-11777?: 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-2019-11777 published?: CVE-2019-11777 was published on 2019-09-11 and last updated on 2026-06-17.

References

https://bugs.eclipse.org/bugs/show_bug.cgi?id=549934

Affected products (1)

cpe:2.3:a:eclipse:paho_java_client:1.2.0:*:*:*:*:*:*:*

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