CVE-2024-40493

9.8 criticalEPSS 0.8%

Critical (9.8) in keith-cullen freecoap. EPSS 0.8% chance of exploitation in the next 30 days.

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`.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-31)
CWE: CWE-476
Published: 2024-10-22
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

keith-cullen:freecoap

References

https://gist.github.com/dqp10515/fe80005e2fb58ed8ada178ac017e4ad4
https://github.com/keith-cullen/FreeCoAP/issues/37

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