Which products and versions are affected by CVE-2013-6955?

Affected: Diskstation Manager (Synology) versions 4.0, 4.2, 4.3, 4.3-3810. The full list is in the CVE brief.

Is CVE-2013-6955 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2013-6955 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2013-6955?

Public exploit code is available.

Is there a fix for CVE-2013-6955?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2013-6955 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2013-6955

CriticalPublic exploit

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…

Published Jan 9, 2014 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2013-6955 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Diskstation Manager (Synology).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 85% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

85%

Higher than 99.7% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2013-6955 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Affected Products

4 affected entries in total

Product	Affected versions	Fixed in
Diskstation ManagerSynology	4.0, 4.2, 4.3, 4.3-3810	n/a

Timeline

Publicly disclosed
Jan 9, 2014
Last updated
Apr 28, 2026

Weakness Type

CWE-264

References

exploitMSF synology_dsm_sliceupload_exec_noauth.rb
exploitExploitDB-30470
otherVU#615910

FAQ

Common Questions.

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.
Affected: Diskstation Manager (Synology) versions 4.0, 4.2, 4.3, 4.3-3810. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2013-6955 Running On Your Attack Surface?

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