Synology FileStation CGI R/W Access via thumb (CVE-2025-29843)
CVE-2025-29843 Published on December 4, 2025
A vulnerability in FileStation thumb cgi allows remote authenticated users to read/write image files.
Vulnerability Analysis
CVE-2025-29843 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a Directory traversal Vulnerability?
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2025-29843 has been classified to as a Directory traversal vulnerability or weakness.
Products Associated with CVE-2025-29843
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Affected Versions
Synology Router Manager (SRM):- Version 1.3 and below 1.3.1-9346-13 is affected.
- Before 1.3 is unknown.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.