Is CVE-2024-40493 actively exploited?

No active exploitation of CVE-2024-40493 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2024-40493 be exploited remotely?

Yes. CVE-2024-40493 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2024-40493?

CVE-2024-40493 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2024-40493

CWE-476Published: October 22, 2024· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1.0 allows remote attackers to cause a denial of service and potentially execute arbitrary code via a specially crafted CoAP packet that causes `coap_msg_get_payload(resp)` to return a null pointer, which is then dereferenced in a call to `memcpy`.

NVD Source

Technical Analysis

CVE-2024-40493 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.