CVE-2024-40493

CRITICAL 9.8CVE-2024-40493 · Published 22/10/2024 · updated 17/06/2026

In short

CVE-2024-40493 is a CRITICAL (CVSS 9.8) vulnerability affecting freecoap (keith-cullen).
Chance of exploitation in the next 30 days (EPSS): 0.78%, higher than 56.2% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
freecoap keith-cullen	`= 1.0`	No fix yet

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

gist.github.com/dqp10515/fe80005e2fb58ed8ada178ac017e4ad4 · Third Party Advisory
keith-cullen/FreeCoAP · Exploit

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