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.
Published: 2025-11-24
Score: 4.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 01 Dec 2025 17:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:libcoap:libcoap:4.3.5:-:*:*:*:*:*:*

Wed, 26 Nov 2025 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Libcoap
Libcoap libcoap
Vendors & Products Libcoap
Libcoap libcoap

Mon, 24 Nov 2025 19:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 24 Nov 2025 14:15:00 +0000

Type Values Removed Values Added
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.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-11-24T18:26:49.240Z

Reserved: 2025-11-18T00:00:00.000Z

Link: CVE-2025-65496

cve-icon Vulnrichment

Updated: 2025-11-24T18:22:33.435Z

cve-icon NVD

Status : Analyzed

Published: 2025-11-24T14:15:47.203

Modified: 2025-12-01T17:00:40.420

Link: CVE-2025-65496

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-11-26T11:10:57Z

Weaknesses