CVE-2025-65494 — HIGH (7.5)

Vulnerability Description

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Libcoap	Libcoap	4.3.5

Related Weaknesses (CWE)

CWE-476

References

https://github.com/obgm/libcoap/issues/1745Issue Tracking
https://github.com/obgm/libcoap/pull/1750Issue TrackingPatch

FAQ

What is CVE-2025-65494?

CVE-2025-65494 is a vulnerability with a CVSS score of 7.5 (HIGH). NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GE...

How severe is CVE-2025-65494?

CVE-2025-65494 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-65494?

Check the references section above for vendor advisories and patch information. Affected products include: Libcoap Libcoap.