{"id":"CVE-2023-51847","aliases":["EUVD-2023-56527","GHSA-hmc2-hhww-hmr3","UBUNTU-CVE-2023-51847"],"status":"published","title":"An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via...","description":"An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoap_context_t function in the src/coap_threadsafe.c:297:3 component.","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":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.00557,"percentile":0.46954,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2024-06-06T21:31:39Z","modified":"2026-11-11T09:37:49Z","affected":[{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libcoap2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.0-2","4.2.1-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libcoap2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.1-1","4.2.1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libcoap3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.0-2","4.3.0-2build1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libcoap3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.1-2","4.3.3-1","4.3.4-1","4.3.4-1.1build2","4.3.4-1.1build3","4.3.4-1.1build4"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"libcoap3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.4-1.1build4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libcoap3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-2","4.3.5-3","4.3.5-4","4.3.5-4ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libcoap3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.4-1.1build4","4.3.5-1","4.3.5-2"]}],"products":[{"vendor":"libcoap","product":"libcoap"}],"references":[{"url":"https://github.com/obgm/libcoap/issues/1302","tags":["x_transferred","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-51847"},{"url":"https://github.com/advisories/GHSA-hmc2-hhww-hmr3"},{"url":"https://ubuntu.com/security/CVE-2023-51847","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-51847","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2023-51847","description":"An 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v.a3ed466 allows a remote attacker to cause a denial of service via...","description":"An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoap_context_t function in the src/coap_threadsafe.c:297:3 component.","status":"published","published":"2024-06-07T00:30:36Z","modified":"2024-07-03T18:45:20Z","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-400"],"updated_at":"2026-11-02T14:57:37.660934Z"}],"nvd":[{"id":"CVE-2023-51847","description":"An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoap_context_t function in the src/coap_threadsafe.c:297:3 component.","status":"published","published":"2024-06-06T22:15:09.95Z","modified":"2026-06-17T06:41:47.337Z","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"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:09:17.205287Z"}],"osv":[{"id":"UBUNTU-CVE-2023-51847","description":"An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoap_context_t function in the src/coap_threadsafe.c:297:3 component.","status":"published","published":"2024-06-06T22:15:00Z","modified":"2026-11-11T09:37:49.787293656Z","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":"2026-11-11T09:59:23.561486Z"}]}}