NULL pointer dereference in Libcoap

CVE-2025-65501

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.

EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

  • Libcoap — versions 4.3.5
  • N/a — versions n/a

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-65501?
CVE-2025-65501 is a medium-severity vulnerability in Libcoap, classified under NULL Pointer Dereference. CVSS score: 4.3/10. Published 2025-11-24.
How severe is CVE-2025-65501?
Medium severity. CVSS v3 base score is 4.3 out of 10.