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Description

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.

PUBLISHED Reserved 2025-11-18 | Published 2025-11-24 | Updated 2025-11-24 | Assigner mitre

References

github.com/obgm/libcoap/issues/1745

github.com/obgm/libcoap/pull/1750

cve.org (CVE-2025-65497)

nvd.nist.gov (CVE-2025-65497)

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