CVE-2024-40493

CRITICAL

keith-cullen FreeCoAP 1.0 - Null Pointer Dereference in coap_client_exchange_blockwise2

Title source: llm

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`.

References (2)

Core 2

Core References

Third Party Advisory

https://gist.github.com/dqp10515/fe80005e2fb58ed8ada178ac017e4ad4

Exploit, Issue Tracking

https://github.com/keith-cullen/FreeCoAP/issues/37

Scores

CVSS v3 9.8

EPSS 0.0076

EPSS Percentile 50.4%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (1)

keith-cullen/freecoap 1.0

Published Oct 22, 2024

Tracked Since Feb 18, 2026