How severe is CVE-2013-6955?

CVE-2013-6955 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2013-6955 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-6955?

CVE-2013-6955 primarily affects Synology Diskstation Manager. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-6955?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2013-6955 published?

CVE-2013-6955 was published on 2014-01-09 and last updated on 2026-06-17.

CVE-2013-6955

CVE-2013-6955 is a critical-severity vulnerability in Synology Diskstation Manager with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 85% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Synology Diskstation Manager
Published: 2014-01-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2013-6955?: CVE-2013-6955 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2013-6955 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-6955?: CVE-2013-6955 primarily affects Synology Diskstation Manager. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-6955?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2013-6955 published?: CVE-2013-6955 was published on 2014-01-09 and last updated on 2026-06-17.

References

http://www.kb.cert.org/vuls/id/615910

Affected products (4)

cpe:2.3:o:synology:diskstation_manager:4.0:*:*:*:*:*:*:*
cpe:2.3:o:synology:diskstation_manager:4.2:*:*:*:*:*:*:*
cpe:2.3:o:synology:diskstation_manager:4.3:*:*:*:*:*:*:*
cpe:2.3:o:synology:diskstation_manager:4.3-3810:*:*:*:*:*:*:*

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