CVE-2025-65495

Integer signedness error in tlsverifycallback in src/coapopenssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2dX509 to return -1 and be misused as a malloc size parameter. Mitigation Mitigation for this issue is either no...

CVE-2025-65501

Null pointer dereference in coapdtlsinfocallback in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSLgetappdata returns NULL...

DEBIAN-CVE-2025-65493

NULL pointer dereference in src/coapopenssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIOgetdata to return NULL...

UBUNTU-CVE-2025-65496

NULL pointer dereference in coapdtlsgeneratecookie in src/coapopenssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSLgetSSLCTX to return NULL...

CVE-2025-65497

CVE-2025-65497 describes a NULL pointer dereference in the CoAP library libcoap 4.3.5 (coap_dtls_generate_cookie in src/coap_openssl.c). A crafted DTLS handshake can cause a denial of service by making SSL_get_SSL_CTX() return NULL. Multiple connected advisories note a fix/update to a 4.3.5a rele...

CVE-2025-65501

Null pointer dereference in coapdtlsinfocallback in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSLgetappdata returns NULL...

CVE-2025-50518

A use-after-free vulnerability exists in the coapdeletepdulkd function within coappdu.c of the libcoap library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading to potential memory corruption or the possibility of executing arbitrary code. NOTE: this...

CVE-2023-51847

An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoapcontextt function in the src/coapthreadsafe.c:297:3 component...

CVE-2024-31031

An issue in coappdu.c in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow...