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CVE-2019-11777

25
FAUCET Score

CVE-2019-11777 is a high-severity vulnerability (CVSS 7.5) affecting the Eclipse Paho Java client library version 1.2.0. It allows an attacker to impersonate a legitimate MQTT server when TLS is used, due to the client failing to check the hostname verification result. This could lead to the client receiving incorrect information from a malicious server. While the vulnerability has a high impact on confidentiality, there is no evidence of active exploitation, public exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
1.2.0CPE matchmatch criteria
cpe:2.3:a:eclipse:paho_java_client:1.2.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.83%
Probability of exploitation in next 30 days
EPSS Percentile
53.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0083 is in the 29th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: org.eclipse.paho:org.eclipse.paho.client.mqttv3Fixed in: 1.2.1
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.8.0Fixed in: org.eclipse.paho.client.mqttv3
View patch

Vendor Advisories (2)

mavenGHSA-63qc-p2x4-9fgfmedium

Improper Handling of Exceptional Conditions and Origin Validation Error in Eclipse Paho Java client library

Sep 17, 2019
redhatCVE-2019-11777Moderate

org.eclipse.paho.client.mqttv3: Improper hostname validation in the MQTT library

Sep 11, 2019

References

bugs.eclipse.org / bugs/show_bug.cgi
Issue TrackingVendor Advisory