CVE-2019-9750: In IoTivity through 1.3.1, the CoAP server interface can be used for Distributed Denial of Service attacks usi

Q: How do I fix CVE-2019-9750?

iotivity: upgrade to newer than 1.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2019-9750 being exploited?

CVE-2019-9750 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-2019-9750 affect?

CVE-2019-9750 affects iotivity. Severity is critical (CVSS 9.1). In IoTivity through 1.3.1, the CoAP server interface can be used for Distributed Denial of Service attacks using source IP address spoofing and UDP-based traffic amplification. The reflected traffic is 6 times bigger than spoofed requests.

Q: How urgent is CVE-2019-9750?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2019-9750 is a critical-severity flaw (CVSS 9.1) affecting iotivity. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In IoTivity through 1.3.1, the CoAP server interface can be used for Distributed Denial of Service attacks using source IP address spoofing and UDP-based traffic amplification. The reflected traffic is 6 times bigger than spoofed requests. This occurs because the construction of a "4.01 Unauthorized" response is mishandled. NOTE: the vendor states "While this is an interesting attack, there is no plan for maintainer to fix, as we are migrating to

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-400
Published	2019-03-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: iotivity

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

Am I affected?

Timeline

2019-03-13 19:29 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

iotivity iotivity UPGRADE

Affected: <= 1.3.1

Fixed in: newer than 1.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.3.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade iotivity

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-2019-9750?

iotivity: upgrade to newer than 1.3.1. Exact commands for each OS are on this page.

Is CVE-2019-9750 being exploited?

CVE-2019-9750 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-2019-9750 affect?

CVE-2019-9750 affects iotivity. Severity is critical (CVSS 9.1). In IoTivity through 1.3.1, the CoAP server interface can be used for Distributed Denial of Service attacks using source IP address spoofing and UDP-based traffic amplification. The reflected traffic is 6 times bigger than spoofed requests.

How urgent is CVE-2019-9750?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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