EUVD-2026-67099
GHSA-r5fc-723c-2fph
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable CoAP service, no authentication required, single malformed packet triggers crash; no confidentiality or integrity impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a vulnerability in the option parsing logic that causes a segmentation fault when processing malformed COAP messages with insufficient option data.
AnalysisAI
Denial-of-service via segmentation fault in ccoap's option parsing logic allows unauthenticated remote attackers to crash any service built on the library by sending a single malformed CoAP message. The vulnerability exists at commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 of the ipflavors/ccoap C library, where the option parser does not adequately validate that sufficient data is present before accessing option fields, triggering an out-of-bounds write (CWE-787). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target host runs a CoAP service built with ccoap at or prior to commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5, with the CoAP UDP port reachable from the attacker's network position. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately reflects the network-reachable, zero-authentication, low-complexity nature of triggering a DoS. … 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 identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit systems to identify all dependencies on ccoap, review deployed versions against commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5, and assess which CoAP endpoints are exposed to untrusted networks. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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