CVE Catalog

CVE-2025-63235

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.32%

24th percentile - higher than 24% of all known CVEs

Summary

In sol commit 373d848 (2024-12-12), the broker does not fully release resources when handling malformed or duplicate CONNECT packets. When clients send invalid CONNECT packets, the server may silently drop the connection or send a CONNACK but fail to close the session or deallocate internal resources. This allows an attacker to create numerous half-open connections that consume memory and file descriptors indefinitely, potentially triggering the Linux OOM killer and causing a denial of service.

Risk Assessment

An attacker can exhaust system resources, leading to service unavailability (DoS). This may affect the stability of the entire system.

Recommendation

Upgrade to a patched version of sol or apply a workaround by limiting the number of connections and monitoring resource usage.

Related vulnerabilities

Original NVD description (English source)

In sol commit 373d848 (2024-12-12), the broker does not fully release resources when handling malformed or duplicate CONNECT packets. When clients send invalid CONNECT packets - either due to repeated attempts or failed authentication - the server may silently drop the connection or send a CONNACK but fail to close the session or deallocate internal resources. This behavior allows an attacker to create numerous half-open connections that consume memory and file descriptors indefinitely, potentially triggering the Linux OOM killer and causing a denial of service.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS