---
id: CVE-2025-29843
title: >-
  A vulnerability in FileStation thumb cgi allows remote authenticated users to
  read/write image files.
summary: >-
  A vulnerability in FileStation thumb cgi allows remote authenticated users to
  read/write image files.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-22
vendor: synology
product: router_manager
affected:
  - 'router_manager >= 1.3, < 1.3.1-9346'
  - router_manager = 1.3.1-9346
patched:
  - router_manager 1.3.1-9346
published: '2025-12-04'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-29843'
references:
  - url: 'https://www.synology.com/en-global/security/advisory/Synology_SA_25_04'
    label: security@synology.com
tags:
  - nvd
epss: 0.00367
epssPercentile: 0.27895
ingestedAt: '2026-09-25T23:21:16.874Z'
---

## Overview

A vulnerability in FileStation thumb cgi allows remote authenticated users to read/write image files.

## Affected

- `router_manager >= 1.3, < 1.3.1-9346`
- `router_manager = 1.3.1-9346`

## Remediation

Upgrade past the affected range:

- `router_manager 1.3.1-9346`