{"id":"DEBIAN-CVE-2025-65501","details":"Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.","modified":"2026-09-01T20:05:55.988563323Z","published":"2025-11-24T14:15:47.950Z","upstream":["CVE-2025-65501"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-65501"}],"affected":[{"package":{"name":"libcoap3","ecosystem":"Debian:12","purl":"pkg:deb/debian/libcoap3?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.1-1","4.3.1-2","4.3.3-1","4.3.4-1","4.3.4-1.1","4.3.4-1.1~exp1","4.3.5-1","4.3.5-2","4.3.5-3","4.3.5-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-65501.json"}},{"package":{"name":"libcoap3","ecosystem":"Debian:13","purl":"pkg:deb/debian/libcoap3?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.4-1.1+deb13u2"}]}],"versions":["4.3.4-1.1","4.3.4-1.1+deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-65501.json"}},{"package":{"name":"libcoap3","ecosystem":"Debian:14","purl":"pkg:deb/debian/libcoap3?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.5-2"}]}],"versions":["4.3.4-1.1","4.3.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-65501.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}]}