What is CVE-2025-65493?

CVE-2025-65493 is a high-severity vulnerability in Libcoap, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-11-24.

How severe is CVE-2025-65493?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Libcoap

CVE-2025-65493

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

EPSS: 0.004 (29.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

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

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

cve@mitre.org (Issue Tracking)
cve@mitre.org (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2025-65493?: CVE-2025-65493 is a high-severity vulnerability in Libcoap, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-11-24.
How severe is CVE-2025-65493?: High severity. CVSS v3 base score is 7.5 out of 10.