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CVE-2024-31031

21
FAUCET Score

CVE-2024-31031 is a high-severity vulnerability (CVSS 7.5) in libcoap 4.3.4, specifically within the coap_pdu.c component, affecting various Fedora Project products. It allows unauthenticated remote attackers to cause undefined behavior through an unsigned integer overflow by sending a specific sequence of messages. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, indicating a low immediate threat.

Impacted Technologies

VendorProductVersion(s)CPE
4.3.4CPE matchmatch criteria
cpe:2.3:a:libcoap:libcoap:4.3.4:*:*:*:*:*:*:*
39CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
40CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.87%
Probability of exploitation in next 30 days
EPSS Percentile
54.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0087 is in the 30th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

lists.fedoraproject.org / archives/list/[email protected]/message/LPENEJBV3KSASIYKNZAKXDAH7Q66KPYG
lists.fedoraproject.org / archives/list/[email protected]/message/TUL7QDYFGEIJVO2ZSG4O5HEAWR6PFC52
github.com / obgm/libcoap/issues/1351
ExploitIssue Tracking
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LPENEJBV3KSASIYKNZAKXDAH7Q66KPYG
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/TUL7QDYFGEIJVO2ZSG4O5HEAWR6PFC52
Mailing ListThird Party Advisory