CVE-2025-65497: Null Pointer Dereference
Published Nov 24, 2025
·Updated
NULL pointer dereference in coapdtlsgeneratecookie() in src/coapopenssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSLgetSSLCTX() to return NULL.
Affected Software
2 affected components
OISM libcoap
libcoap libcoap=4.3.5
Remediation
Patch Available
Event History
Nov 24, 2025
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Data Sourced
via NVD·02:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-65497?
CVE-2025-65497 is classified as a denial of service vulnerability.
2
How do I fix CVE-2025-65497?
To fix CVE-2025-65497, update OISM libcoap to the latest version where the vulnerability is addressed.
3
What causes the vulnerability CVE-2025-65497?
CVE-2025-65497 is caused by a null pointer dereference in the coap_dtls_generate_cookie() function.
4
Who is affected by CVE-2025-65497?
Users of OISM libcoap 4.3.5 are affected by CVE-2025-65497.
5
Can CVE-2025-65497 be exploited remotely?
Yes, CVE-2025-65497 can be exploited remotely via a crafted DTLS handshake.