---
id: CVE-2025-63235
title: >-
  In sol commit 373d848 (2024-12-12), the broker does not fully release
  resources when handling malformed or duplicate CONNECT packets
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 - either due to repeated attempts or failed
  authentication - …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
published: '2026-08-07'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T11:10:00.150'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-63235'
references:
  - url: 'https://github.com/codepr/sol/issues/12'
    label: cve@mitre.org
  - url: >-
      https://github.com/peter-pe/sol-vulnerabilities/blob/main/CVE-2025-63235.md
    label: cve@mitre.org
  - url: 'https://github.com/codepr/sol/issues/12'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://github.com/peter-pe/sol-vulnerabilities/blob/main/CVE-2025-63235.md
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
ingestedAt: '2026-09-29T11:32:41.220Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.