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CVE-2015-2851

19
FAUCET Score

CVE-2015-2851 describes a local privilege escalation vulnerability in Synology Cloud Station versions 1.1-2291 through 3.1-3320 on macOS. An authenticated local user can exploit a flaw in the client_chown function to change the ownership of arbitrary files, leading to root access. This vulnerability has a CVSS score of 6.8, indicating high severity with low attack complexity and complete impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.1-2291CPE matchmatch criteria
cpe:2.3:a:synology:cloud_station:1.1-2291:*:*:*:*:*:*:*
2.0-2291CPE matchmatch criteria
cpe:2.3:a:synology:cloud_station:2.0-2291:*:*:*:*:*:*:*
2.0-2402CPE matchmatch criteria
cpe:2.3:a:synology:cloud_station:2.0-2402:*:*:*:*:*:*:*
2.1-2561CPE matchmatch criteria
cpe:2.3:a:synology:cloud_station:2.1-2561:*:*:*:*:*:*:*
2.1-2570CPE matchmatch criteria
cpe:2.3:a:synology:cloud_station:2.1-2570:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
SINGLE
Exploitability Score
3.1
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.76%
Probability of exploitation in next 30 days
EPSS Percentile
51.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0076 is in the 95th percentile among its peer group of 15,937 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

kb.cert.org / vuls/id/551972
Third Party AdvisoryUS Government Resource
kb.cert.org / vuls/id/BLUU-9VBU45
Third Party AdvisoryUS Government Resource
securityfocus.com / bid/74826