Is CVE-2013-6955 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2013-6955, but active exploitation has not been confirmed.

Can CVE-2013-6955 be exploited remotely?

Yes. CVE-2013-6955 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2013-6955?

CVE-2013-6955 has a CVSS score of 10.0 (CRITICAL).

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CRITICALPOC

CVE-2013-6955

CWE-264Published: January 9, 2014· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

webman/imageSelector.cgi in Synology DiskStation Manager (DSM) 4.0 before 4.0-2259, 4.2 before 4.2-3243, and 4.3 before 4.3-3810 Update 1 allows remote attackers to append data to arbitrary files, and consequently execute arbitrary code, via a pathname in the SLICEUPLOAD X-TMP-FILE HTTP header.

NVD Source

Technical Analysis

CVE-2013-6955 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2013-6955. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.