CVE-2025-65500: Null Pointer Dereference
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
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/libcoap3to a version that resolves this vulnerability.Fixed in 4.3.4-1.1+deb13u2 - Upgrade
Upgrade
debian/libcoap3to a version that resolves this vulnerability.Fixed in 4.3.5-2 - Upgrade
Upgrade
debian/libcoap3to a version that resolves this vulnerability.Fixed in 4.3.4-1.1+deb13u3Fixed in 4.3.5-4
Event History
Frequently Asked Questions
What is the severity of CVE-2025-65500?
CVE-2025-65500 has a severity rating that indicates a denial of service vulnerability due to a NULL pointer dereference.
How do I fix CVE-2025-65500?
To fix CVE-2025-65500, upgrade to the latest version of OISM libcoap that addresses this vulnerability.
Who is affected by CVE-2025-65500?
Users of OISM libcoap version 4.3.5 are affected by CVE-2025-65500.
What attack vector is utilized in CVE-2025-65500?
CVE-2025-65500 can be exploited through a crafted DTLS handshake that triggers the vulnerability.
What is the potential impact of CVE-2025-65500?
The potential impact of CVE-2025-65500 is a denial of service that disrupts the normal functioning of the affected software.