EUVD-2026-67098
GHSA-hpv9-cj7v-9vxp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable CoAP service, no auth required, zero-length option triggers crash; only availability impacted, no scope change.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a null pointer dereference vulnerability in the coap_dump_msg() function when processing COAP messages containing options with zero length.
AnalysisAI
Null pointer dereference in ccoap's coap_dump_msg() function causes remote denial of service when processing CoAP messages that carry options with zero-length values. The flaw is pinned to commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 of the ipflavors/ccoap library. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CoAP service must be network-reachable by the attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) characterizes this as a straightforward remote unauthenticated DoS with no complexity barrier. … 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 fixed tagged version has been identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems and applications using the ipflavors/ccoap library, particularly embedded services, IoT platforms, and sensor networks, and document their network exposure and 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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