AUGUST 16, 2026
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Case File

CVE-2025-63235

HIGH · CVSS 7.5 EPSS 0.32% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-07 · Last synced 2026-08-16

CyberRota Analysis

AI-Generated

The vulnerability affects the Linux broker, which fails to properly release resources when processing malformed or duplicate CONNECT packets, leading to the potential for an attacker to create numerous half-open connections. This can result in excessive memory and file descriptor consumption, ultimately triggering the Linux OOM killer and causing a denial of service. Organizations utilizing this broker should prioritize patching to mitigate the risk of service disruption.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2025-63235
Severity
HIGH
CVSS
7.5
EPSS
0.32%
Linux

Original NVD Description

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.