What is CVE-2019-11777?

CVE-2019-11777 is a high-severity vulnerability in Eclipse Paho Java Client, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2019-09-11.

How severe is CVE-2019-11777?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2019-11777 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Eclipse Paho Java Client

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.

Published 2019-09-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Eclipse Paho Java Client — versions 1.2.0
The Eclipse Foundation Paho — versions 1.2.0

Weakness classification (CWE)

Public proof-of-concept exploits

11notes/docker-unifi

References

bugs.eclipse.org/bugs/show_bug.cgi (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2019-11777?: CVE-2019-11777 is a high-severity vulnerability in Eclipse Paho Java Client, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2019-09-11.
How severe is CVE-2019-11777?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-11777 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.