CVE-2024-31031

Name: CVE-2024-31031
Creator: NVD / NIST
Published: 2024-04-17T19:15:07.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.87%

Last modified Jun 17, 2026

CVE-2024-31031 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow.. EPSS estimates a 0.87% chance of exploitation in the next 30 days.

Description

An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.87%

54.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Libcoap	Libcoap	4.3.4
Fedoraproject	Fedora	39
Fedoraproject	Fedora	40

References

https://github.com/obgm/libcoap/issues/1351Exploit, Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPENEJBV3KSASIYKNZAKXDAH7Q66KPYG/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TUL7QDYFGEIJVO2ZSG4O5HEAWR6PFC52/Mailing List, Third Party Advisory
https://github.com/obgm/libcoap/issues/1351Exploit, Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPENEJBV3KSASIYKNZAKXDAH7Q66KPYG/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TUL7QDYFGEIJVO2ZSG4O5HEAWR6PFC52/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LPENEJBV3KSASIYKNZAKXDAH7Q66KPYG/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TUL7QDYFGEIJVO2ZSG4O5HEAWR6PFC52/

Timeline

Published: Apr 17, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-31031?

An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow.

How severe is CVE-2024-31031?

CVE-2024-31031 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.87% probability of exploitation in the next 30 days.

How do I fix CVE-2024-31031?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-31031?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST