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No exploitation reportedFix available

CVE-2019-11779

No exploitation reported by the sources we read.

  • Published2019-09-19
  • WeaknessCWE-674 · CWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2019-09-1914:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-11779?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-11779?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
29.x= 29no fix published
30.x= 30no fix published
31.x= 31no fix published
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
10.0= 10.0no fix published
Eclipse mosquitto
BranchAffectedFixed in
1.6≥ 1.6, < 1.6.61.6.6
1.5≥ 1.5, < 1.5.91.5.9

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mosquittoSUSE:Package Hub 15 SP1all versions · fixed in 1.5.7-bp151.3.3.1
  • mosquittoopenSUSE:Leap 15.1all versions · fixed in 1.5.7-lp151.2.3.1
  • mosquittoMageia:7all versions · fixed in 1.6.6-1.mga7
  • mosquittoDebian:14all versions · fixed in 1.6.6-1
  • mosquittoDebian:13all versions · fixed in 1.6.6-1
  • mosquittoDebian:12all versions · fixed in 1.6.6-1
  • mosquittoDebian:10all versions · fixed in 1.5.7-1+deb10u1
  • mosquittoDebian:8all versions · fixed in 1.3.4-2+deb8u4

17 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.16.5read 2026-10-23
  • NVDCVSS 2.04read 2026-10-23
  • CNAweakness (CWE)CWE-754known since 2026-10-23
  • NVDweakness (CWE)CWE-674read 2026-10-23
  • FIRST EPSSEPSS score2.7 %2026-11-03
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
2019-09-19
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2019-11779?

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.

Is CVE-2019-11779 actively exploited?

Active exploitation of CVE-2019-11779 has not been confirmed. Its EPSS score was 2.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-11779?

CVE-2019-11779 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record