CVE-2024-8376: In Eclipse Mosquitto up to version 2.0.18a, an attacker can achieve memory leaking, segmentation fault or heap

Q: How do I fix CVE-2024-8376?

mosquitto: upgrade to 2.0.19. Exact commands for each OS are on this page.

Q: Is CVE-2024-8376 being exploited?

CVE-2024-8376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-8376 affect?

CVE-2024-8376 affects mosquitto. Severity is high (CVSS 7.5). In Eclipse Mosquitto up to version 2.0.18a, an attacker can achieve memory leaking, segmentation fault or heap-use-after-free by sending specific sequences of "CONNECT", "DISCONNECT", "SUBSCRIBE", "UNSUBSCRIBE" and "PUBLISH" packets.

Q: How urgent is CVE-2024-8376?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2024-8376 is a high-severity flaw (CVSS 7.5) affecting mosquitto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Eclipse Mosquitto up to version 2.0.18a, an attacker can achieve memory leaking, segmentation fault or heap-use-after-free by sending specific sequences of "CONNECT", "DISCONNECT", "SUBSCRIBE", "UNSUBSCRIBE" and "PUBLISH" packets.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-401, CWE-416, CWE-755
Published	2024-10-11
Last modified	2026-06-17

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-10-11 16:15 UTCPublished CVE record published
2026-06-17 08:22 UTCUpdated Record last modified

eclipse mosquitto UPGRADE

Affected: < 2.0.19

Fixed in: 2.0.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mosquitto || rpm -q mosquitto || mosquitto --version

2. UPGRADE to 2.0.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mosquitto

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mosquitto

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-8376?

mosquitto: upgrade to 2.0.19. Exact commands for each OS are on this page.

Is CVE-2024-8376 being exploited?

CVE-2024-8376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-8376 affect?

CVE-2024-8376 affects mosquitto. Severity is high (CVSS 7.5). In Eclipse Mosquitto up to version 2.0.18a, an attacker can achieve memory leaking, segmentation fault or heap-use-after-free by sending specific sequences of "CONNECT", "DISCONNECT", "SUBSCRIBE", "UNSUBSCRIBE" and "PUBLISH" packets.

How urgent is CVE-2024-8376?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-3935 MEDIUM 6.5 UPGRADE In Eclipse Mosquito, versions from 2.0.0 through 2.0.18, if a Mosquitto broker is configured to create an outg
CVE-2024-10525 CRITICAL 9.8 UPGRADE In Eclipse Mosquitto, from version 1.3.2 through 2.0.18, if a malicious broker sends a crafted SUBACK packet w

References

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