libcoap3: NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote att...
CVE-2025-65500 is fixed in libcoap3 on 1 platform, first by DEBIAN-CVE-2025-65500, released November 24, 2025. It is not reported as exploited. Patch Radar priority: Routine.
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libcoap3 · Debian 13.5 (trixie) | 4.3.4-1.1+deb13u2 | DEBIAN-CVE-2025-65500 | Nov 24, 2025 |
| libcoap3 · Debian 14 | 4.3.5-2 | DEBIAN-CVE-2025-65500 | Nov 24, 2025 |
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