CVE-2025-65495

HIGH EPSS 12.3%
Published Nov 24, 20257mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Nov 24, 2025 7mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
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

Threat Intelligence

EPSS Exploit Probability
12.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-195

Affected Products 1

VendorProductVersionRange
libcoaplibcoap4.3.5any

References 2

  • github.com https://github.com/obgm/libcoap/issues/1744
    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