CVE-2025-65501
Medium
Description
Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.
SeverityMedium
CVSS4.3
Exploit probability—
ProductLibcoap
PublishedNov 24, 2025
First seenNov 24, 2025
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libcoap libcoap | 4.3.5 | — |
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