{"id":"CVE-2023-33973","aliases":["EUVD-2023-38099","GHSA-r2pv-3jqc-vh7w"],"status":"published","title":"RIOT-OS vulnerable to NULL pointer dereference during NHC encoding","description":"RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00963,"percentile":0.61888,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2023-05-30T16:18:04Z","modified":"2026-10-28T10:38:51Z","products":[{"vendor":"riot-os","product":"riot"}],"references":[{"url":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-r2pv-3jqc-vh7w","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://github.com/RIOT-OS/RIOT/pull/19678","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","fix"]},{"url":"https://github.com/RIOT-OS/RIOT/commit/c9d7863e5664a169035038628029bb07e090c5ff","tags":["x_refsource_MISC","x_transferred","Patch","fix"]},{"url":"https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1067","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1495","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1511","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1644","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1655","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/33xxx/CVE-2023-33973.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-33973","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-33973","title":"RIOT-OS vulnerable to NULL pointer dereference during NHC encoding","description":"RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.","status":"published","published":"2023-05-30T16:18:04.163Z","modified":"2025-01-10T16:54:29.703Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:35:34.55015Z"}],"euvd":[{"id":"EUVD-2023-38099","description":"RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.","status":"published","published":"2023-05-30T16:18:04Z","modified":"2025-01-10T16:54:29Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:21.63355Z"}],"nvd":[{"id":"CVE-2023-33973","description":"RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.","status":"published","published":"2023-05-30T17:15:10.127Z","modified":"2026-06-17T06:02:38Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:08:03.795015Z"}],"osv":[{"id":"CVE-2023-33973","title":"RIOT-OS vulnerable to NULL pointer dereference during NHC encoding","description":"RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.","status":"published","published":"2023-05-30T16:18:04.163Z","modified":"2026-10-28T10:38:51.872815896Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T15:44:32.116263Z"}]}}