{"affected":[{"defaultStatus":"unaffected","ecosystem":"https://github.com/zephyrproject-rtos/zephyr","packageName":"zephyr","product":"zephyr","source":"CNA: zephyr","vendor":"zephyrproject","versions":[{"lessThan":"4.3.2","status":"affected","version":"4.3.0","versionType":"semver"},{"lessThan":"4.4.2","status":"affected","version":"4.4.0","versionType":"semver"}]}],"cveId":"CVE-2026-13217","cwes":["CWE-476"],"description":"The OCPP 1.6 client in subsys/net/lib/ocpp/ocpp.c reconstructs a session handle and PDU id from the uid field of a CALLRESULT message. In ocpp_process_server_msg() the code calls atoi(strtok_r(uid, \"-\", &tmp)) without checking the strtok_r return value. When the server-supplied uid is empty or contains no - delimiter, strtok_r() returns NULL and atoi(NULL) dereferences a NULL pointer, which is undefined behaviour.\n\nThe uid originates from network data: parse_rpc_msg() in subsys/net/lib/ocpp/ocpp_j.c JSON-parses a frame received from the OCPP central system over TCP/WebSocket and copies the server-controlled string into the local buffer. A malicious or compromised central system, or a man-in-the-middle on a non-TLS ws:// connection, can return a malformed uid to reach the defect. No authentication beyond the existing server connection (or MITM position) is required, and the reconstructed pointer is membership-validated by ocpp_session_is_valid(), so the impact is limited to the NULL dereference rather than arbitrary pointer use.\n\nOn Zephyr targets that trap access to address 0 (MMU/MPU platforms or CONFIG_NULL_POINTER_EXCEPTION_DETECTION), the dereference faults inside the OCPP reader thread and invokes the fatal handler, producing a remote denial of service of the charge point; on bare targets where address 0 is readable the call returns 0 and is benign, so the impact is availability-only and platform-conditional.\n\nThe applied fix guards only the first atoi(); the second strtok_r(NULL, \"-\", &tmp) followed by pdu = atoi(buf) in the same function remains unguarded and the identical NULL dereference is still reachable from the same network input when the uid has a first token but no second --delimited token. A complete fix should validate the second token as well.","epss":{"date":"2026-11-03","percentile":0.51915,"score":0.00667},"exploits":[],"kev":null,"metrics":[{"score":5.9,"severity":"medium","source":"CNA: zephyr","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":5.9,"severity":"medium","source":"NVD: vulnerabilities@zephyrproject.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793769522010,"publishedAt":1787673938128,"references":[{"source":"CNA: zephyr","tags":["patch"],"url":"https://github.com/zephyrproject-rtos/zephyr/commit/4d8a9eb1448061ccee557ef20a2a58aec91d9cad"},{"source":"CNA: zephyr","tags":["patch"],"url":"https://github.com/zephyrproject-rtos/zephyr/commit/eba36f8ed63a055ed862ab2b4bb801b6dce07bb7"},{"source":"CNA: zephyr","tags":[],"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w234-pcxp-4q8r"},{"source":"vulnerabilities@zephyrproject.org","tags":[],"url":"https://github.com/zephyrproject-rtos/zephyr/commit/4d8a9eb1448061ccee557ef20a2a58aec91d9cad"},{"source":"vulnerabilities@zephyrproject.org","tags":[],"url":"https://github.com/zephyrproject-rtos/zephyr/commit/eba36f8ed63a055ed862ab2b4bb801b6dce07bb7"},{"source":"vulnerabilities@zephyrproject.org","tags":[],"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w234-pcxp-4q8r"}],"remediation":[{"kind":"fix","source":"CNA: zephyr","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/zephyrproject-rtos/zephyr/commit/4d8a9eb1448061ccee557ef20a2a58aec91d9cad"},{"kind":"fix","source":"CNA: zephyr","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/zephyrproject-rtos/zephyr/commit/eba36f8ed63a055ed862ab2b4bb801b6dce07bb7"}],"revision":"7b9026d5d9e1d39379590e170a2f16a01c135662d74eb2766a60e2e75a6777a3","sources":[{"modifiedAt":1793768386392,"name":"CNA: zephyr","retrievedAt":1793769037520,"url":"https://www.cve.org/CVERecord?id=CVE-2026-13217"},{"modifiedAt":1793769522010,"name":"NVD","retrievedAt":1793772962168,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13217"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793769047469,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-13217"}],"ssvc":{"assessedAt":1787686823470,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"NULL-pointer dereference in Zephyr OCPP CALLRESULT parsing via unchecked strtok_r/atoi","updatedAt":1793772962168}