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.

fedora FEDORA-2025-6a43695048: libcoap-4.3.5a-1.fc42

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-6a43695048 advisory.

    Update to security release 4.3.5a


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-d408d76c4a advisory.

    Update to security release 4.3.5a


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-65500)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
277587	Fedora 42 : libcoap (2025-6a43695048)	Nessus	Fedora Local Security Checks	critical
277552	Fedora 43 : libcoap (2025-d408d76c4a)	Nessus	Fedora Local Security Checks	critical
276677	Linux Distros Unpatched Vulnerability : CVE-2025-65500	Nessus	Misc.	medium

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CVE-2025-65500

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