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 malloc() size parameter.
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Fixes

Solution

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Workaround

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History

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

Type Values Removed Values Added
Weaknesses CWE-195
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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

Type Values Removed Values Added
Description 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 malloc() size parameter.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-11-24T14:41:15.867Z

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

Link: CVE-2025-65495

cve-icon Vulnrichment

Updated: 2025-11-24T14:40:09.060Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-24T14:15:47.053

Modified: 2025-11-25T22:16:16.690

Link: CVE-2025-65495

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.