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CVE-2019-11779· NVD / CVE Program· CNA eclipse

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of appro

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.7% (FIRST EPSS); higher than 85.9% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: mosquitto (Alpine:v3.10) 1.6.3-r1; mosquitto (Alpine:v3.11) 1.6.7-r0; mosquitto (Alpine:v3.9) 1.5.6-r1.

Low priority for now. Upgrade to mosquitto (Alpine:v3.10) 1.6.3-r1; mosquitto (Alpine:v3.11) 1.6.7-r0; mosquitto (Alpine:v3.9) 1.5.6-r1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Sep 19, 2019
Updated
Jun 16, 2026
EPSS
2.7% · 85th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.7%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-11779

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
eclipsemosquitto
canonicalubuntu linux
opensusebackports sle
opensuseleap
fedoraprojectfedora
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux19.04
  • debian debian linux10.0
  • debian debian linux8.0
  • eclipse mosquitto1.5 and later · before 1.5.9
  • eclipse mosquitto1.6 and later · before 1.6.6
  • fedoraproject fedora29
  • fedoraproject fedora30
  • fedoraproject fedora31
  • opensuse backports sle15.0
  • opensuse leap15.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (eclipse). Independent of NVD's CPE analysis and usually ahead of it.

  • The Eclipse Foundation Eclipse Mosquitto

    • 1.5.0 to 1.6.5 inclusiveaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10mosquittofrom 1.5 · before 1.6.3-r11.6.3-r1
Alpine:v3.11mosquittofrom 1.5 · before 1.6.7-r01.6.7-r0
Alpine:v3.9mosquittofrom 1.5 · before 1.5.6-r11.5.6-r1
Debian:10mosquittobefore 1.5.7-1+deb10u11.5.7-1+deb10u1
Debian:12mosquittobefore 1.6.6-11.6.6-1
Debian:8mosquittobefore 1.3.4-2+deb8u41.3.4-2+deb8u4
openSUSE:Leap 15.1mosquittobefore 1.5.7-lp151.2.3.11.5.7-lp151.2.3.1
SUSE:Package Hub 15 SP1mosquittobefore 1.5.7-bp151.3.3.11.5.7-bp151.3.3.1

Same product

eclipse: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-10525Eclipse Mosquito: Heap Buffer Overflow in my_subscribe_callback
    46Plan
  • CVE-2018-12543In Eclipse Mosquitto versions 1.5 to 1.5.2 inclusive, if a message is published to Mosquitto that has a topic starting with $, but that is n
    41Plan
  • CVE-2018-12551When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use a password file for authentication, any malformed data in the p
    32Monitor
  • CVE-2018-12550When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comme
    32Monitor
  • CVE-2017-7651In Eclipse Mosquitto 1.4.14, a user can shutdown the Mosquitto server simply by filling the RAM memory with a lot of connections with large
    32Monitor
  • CVE-2017-7655In Eclipse Mosquitto version from 1.0 to 1.4.15, a Null Dereference vulnerability was found in the Mosquitto library which could lead to cra
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:mosquitto1.6.3-r1 · Alpine:v3.10Package registry (OSV)
debian:mosquitto1.6.6-1 · Debian:12Package registry (OSV)
opensuse:mosquitto1.5.7-lp151.2.3.1 · openSUSE:Leap 15.1Package registry (OSV)
suse:mosquitto1.5.7-bp151.3.3.1 · SUSE:Package Hub 15 SP1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-754 · Improper Check for Unusual or Exceptional Conditions

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records