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CVE-2025-65500 Affecting libcoap2 package, versions *

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

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  • Snyk IDSNYK-DEBIAN11-LIBCOAP2-14104222
  • published25 Nov 2025
  • disclosed24 Nov 2025
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Introduced: 24 Nov 2025

NewCVE-2025-65500  (opens in a new tab)

How to fix?

There is no fixed version for Debian:11 libcoap2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcoap2 package and not the libcoap2 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.