CVE-2025-65501Network attack vector

Remote crash via unchecked DTLS app-data pointer

Published Nov 24, 2025 · Updated Nov 24, 2025

Null pointer dereference in OISM libcoap 4.3.5 allows remote attackers to crash a DTLS-enabled process during a handshake. coap_dtls_info_callback() treats an unchecked NULL result from SSL_get_app_data() as a session and passes it to coap_session_str(). An unauthenticated attacker must reach a DTLS endpoint, and CISA reports that exploitation requires user interaction; the demonstrated consequence is process termination.

CVSS severity4.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in OISM libcoap 4.3.5 allows remote attackers to crash a DTLS-enabled process during a handshake. coap_dtls_info_callback() treats an unchecked NULL result from SSL_get_app_data() as a session and passes it to coap_session_str(). An unauthenticated attacker must reach a DTLS endpoint, and CISA reports that exploitation requires user interaction; the demonstrated consequence is process termination.

The record

CVE
CVE-2025-65501
Published
Nov 24, 2025
Updated
Nov 24, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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