CVE-2025-65497

MEDIUM EPSS 13.2%
Published Nov 24, 20257mo ago · Modified Jun 17, 20261w ago
4.3 CVSS 3.1
Medium
Find Similar
Published Nov 24, 2025 7mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
4.3
Exploitability
2.8
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity None
Availability Low

Threat Intelligence

EPSS Exploit Probability
13.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 1

VendorProductVersionRange
libcoaplibcoap4.3.5any

References 2

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

Remediation

  • github.com https://github.com/obgm/libcoap/pull/1750
    Issue TrackingPatch