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CVE-2025-65495

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Date: November 23, 2025

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.

Severity Score

Related Resources (4)

https://github.com/obgm/libcoap/issues/1744
https://github.com/obgm/libcoap/pull/1750
https://nvd.nist.gov/vuln/detail/CVE-2025-65495
https://www.mend.io/vulnerability-database/CVE-2025-65495

Severity Score

Weakness Type (CWE)

Signed to Unsigned Conversion Error

CWE-195

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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