What is CVE-2025-65495?

CVE-2025-65495 is a high-severity vulnerability in Libcoap, classified under CWE-195. CVSS score: 7.5/10. Published 2025-11-24.

How severe is CVE-2025-65495?

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

Vulnerability in Libcoap

CVE-2025-65495

Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a mallo…

EPSS: 0.002 (12.5th 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-195

References

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

Frequently asked questions

What is CVE-2025-65495?: CVE-2025-65495 is a high-severity vulnerability in Libcoap, classified under CWE-195. CVSS score: 7.5/10. Published 2025-11-24.
How severe is CVE-2025-65495?: High severity. CVSS v3 base score is 7.5 out of 10.