CVE-2024-31030: An issue in coap_msg.c in Keith Cullen's FreeCoAP v.0.7 allows remote attackers to cause a Denial of Service o

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CRITICAL 9.1REMOTEDOWNGRADE

CVE-2024-31030 is a critical-severity flaw (CVSS 9.1) affecting freecoap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in coap_msg.c in Keith Cullen's FreeCoAP v.0.7 allows remote attackers to cause a Denial of Service or potentially disclose information via a specially crafted packet.

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-476
Published	2024-05-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: keith-cullen

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

Am I affected?

Timeline

2024-05-31 18:15 UTCPublished CVE record published
2026-06-17 07:27 UTCUpdated Record last modified

keith-cullen freecoap DOWNGRADE

Affected: 0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.7 (Debian / Ubuntu)

apt-cache madison freecoap sudo apt install freecoap=<VERSION_BEFORE_0.7> sudo apt-mark hold freecoap

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list freecoap sudo dnf downgrade freecoap-<VERSION_BEFORE_0.7> sudo dnf versionlock add freecoap

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-2024-31030?

freecoap: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-31030 being exploited?

CVE-2024-31030 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-2024-31030 affect?

CVE-2024-31030 affects freecoap. Severity is critical (CVSS 9.1). An issue in coap_msg.c in Keith Cullen's FreeCoAP v.0.7 allows remote attackers to cause a Denial of Service or potentially disclose information via a specially crafted packet.

How urgent is CVE-2024-31030?

Priority 56/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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