EUVD-2026-67096
GHSA-cmf6-2rf8-75m6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable CoAP server requires no auth or interaction; crash-only impact means C:N/I:N/A:H with unchanged scope.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a null pointer dereference vulnerability in the coap_server_handle_session() function when processing COAP messages containing URI_PATH options with NULL data pointers. When the server searches for a URI_PATH option matching the string "separate", it directly calls strncmp() on option_list[i].data without checking if the pointer is NULL. This causes a segmentation fault when the option's data field is NULL.
AnalysisAI
Null pointer dereference in ccoap's CoAP server (commit 77f55c4b) allows unauthenticated remote attackers to crash the server process by sending a crafted CoAP message. The vulnerability exists in coap_server_handle_session(), which calls strncmp() on a URI_PATH option's data pointer without first validating that the pointer is non-NULL, triggering a segmentation fault on receipt of a malformed packet. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - unauthenticated remote exploitation against any ccoap server instance (at commit 77f55c4b) accessible over UDP on its CoAP listening port. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately captures the risk envelope: any network-reachable ccoap server can be crashed with a single malformed CoAP packet requiring no authentication and minimal effort. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch or tagged fix version has been identified at time of analysis; the vulnerability report references the upstream repository at https://github.com/ipflavors/ccoap but no remediation commit or release is cited. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: conduct inventory of systems running ccoap CoAP server and assess operational criticality. …
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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