CVE-2016-10523: MQTT before 3.4.6 and 4.0.x before 4.0.5 allows specifically crafted MQTT packets to crash the application, ma

Q: How do I fix CVE-2016-10523?

mqtt-packet: upgrade to 3.4.6, 4.0.5. Exact commands for each OS are on this page.

Q: Is CVE-2016-10523 being exploited?

CVE-2016-10523 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-2016-10523 affect?

CVE-2016-10523 affects mqtt-packet. Severity is high (CVSS 7.5). MQTT before 3.4.6 and 4.0.x before 4.0.5 allows specifically crafted MQTT packets to crash the application, making a DoS attack feasible with very little bandwidth.

Q: How urgent is CVE-2016-10523?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2016-10523 is a high-severity flaw (CVSS 7.5) affecting mqtt-packet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MQTT before 3.4.6 and 4.0.x before 4.0.5 allows specifically crafted MQTT packets to crash the application, making a DoS attack feasible with very little bandwidth.

Why this priority

High severity
Public exploit reference
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	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-400, CWE-119
Published	2018-05-31
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: mqtt-packet project

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

Am I affected?

Timeline

2018-05-31 20:29 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

mqtt-packet project mqtt-packet UPGRADE

Affected: < 3.4.6 · >= 4.0.0 and < 4.0.5

Fixed in: 3.4.6, 4.0.5

Safe to downgrade to: a release before 4.0.0

1. Check installed version

npm ls mqtt-packet

2. UPGRADE to 3.4.6

npm install mqtt-packet@">=3.4.6"

3. If no update is available yet, DOWNGRADE to a release before 4.0.0

npm view mqtt-packet versions npm install mqtt-packet@"<4.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2016-10523?

mqtt-packet: upgrade to 3.4.6, 4.0.5. Exact commands for each OS are on this page.

Is CVE-2016-10523 being exploited?

CVE-2016-10523 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-2016-10523 affect?

CVE-2016-10523 affects mqtt-packet. Severity is high (CVSS 7.5). MQTT before 3.4.6 and 4.0.x before 4.0.5 allows specifically crafted MQTT packets to crash the application, making a DoS attack feasible with very little bandwidth.

How urgent is CVE-2016-10523?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-5432 HIGH 7.5 UPGRADE A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.

References

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