What is CVE-2013-6955?

CVE-2013-6955 is a vulnerability in Synology Diskstation Manager, classified under CWE-264. Published 2014-01-09.

Is CVE-2013-6955 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Synology Diskstation Manager

CVE-2013-6955

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.

Published 2014-01-09 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 10.0 (High). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.846 (99.7th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.846 · newest: 0.846 · change: 0.000

Affected products

Synology Diskstation Manager — versions 4.0, 4.2, 4.3

Weakness classification (CWE)

CWE-264

Public proof-of-concept exploits

rapid7/metasploit-framework

References

www.kb.cert.org/vuls/id/615910 (US Government Resource, third-party-advisory)

Frequently asked questions

What is CVE-2013-6955?: CVE-2013-6955 is a vulnerability in Synology Diskstation Manager, classified under CWE-264. Published 2014-01-09.
Is CVE-2013-6955 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.