EUVD-2026-67097
GHSA-59pv-qgfv-jx2f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Race condition exploitation requires precise inter-thread timing, warranting AC:H; no authentication is needed against the network-reachable CoAP service.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
A null pointer dereference vulnerability exists in the server-side session management logic of ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5. The issue is caused by a race condition between the request dispatch thread and the session cleanup thread when accessing shared session list nodes without proper synchronization.
AnalysisAI
Null pointer dereference in ccoap (commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5) allows remote unauthenticated attackers to crash the CoAP server by submitting requests that trigger a race condition between the session dispatch and cleanup threads. The impact is confined to availability - the server process crashes, producing a denial-of-service condition with no confidentiality or integrity consequences. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network connectivity to the CoAP server on UDP port 5683 (or CoAPS TCP port 5684 if applicable). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 High with vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H describes a remotely exploitable, unauthenticated denial-of-service requiring no user interaction. … 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 has been identified at the time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all ccoap deployments (identify commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 or potentially vulnerable versions), verify CoAP port exposure, and enable detailed access logging. …
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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