CVE-2024-31030Public exploitNetwork attack vector

Service interruption via null payload memcpy

Published May 31, 2024 · Updated Feb 13, 2025

Null-pointer dereference in FreeCoAP 0.7 allows remote attackers to interrupt a CoAP test server with a crafted UDP packet. The server_handle_regular handler passes the null result for an empty request payload to memcpy while constructing its response. Any unauthenticated sender able to reach the UDP listener can trigger undefined behavior; the public reproducer shows a sanitizer-detected fault, not information disclosure.

CVSS severity9.1
Critical
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null-pointer dereference in FreeCoAP 0.7 allows remote attackers to interrupt a CoAP test server with a crafted UDP packet. The server_handle_regular handler passes the null result for an empty request payload to memcpy while constructing its response. Any unauthenticated sender able to reach the UDP listener can trigger undefined behavior; the public reproducer shows a sanitizer-detected fault, not information disclosure.

The record

CVE
CVE-2024-31030
Published
May 31, 2024
Updated
Feb 13, 2025
Vendor
Keith Cullen
Product
FreeCoAP
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Keith Cullen · FreeCoAPversion=0.7

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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