What’s Vulnerable › Vulnerabilities

CVE-2024-40493

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-10-22 · updated 2026-06-17
• Weakness: CWE-476

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`.

Affected products

• Keith-Cullen Freecoap: 1.0

References

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

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