How severe is CVE-2017-11157?

CVE-2017-11157 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11157 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11157?

CVE-2017-11157 affects Synology Cloud Station Backup. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-11157?

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

When was CVE-2017-11157 published?

CVE-2017-11157 was published on 2017-08-30 and last updated on 2026-06-17.

CVE-2017-11157

CVE-2017-11157 is a high-severity vulnerability in Synology Cloud Station Backup with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-426.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-426
Affected product: Synology Cloud Station Backup
Published: 2017-08-30
Last modified: 2026-06-17

Description

Multiple untrusted search path vulnerabilities in the installer in Synology Cloud Station Backup before 4.2.5-4396 on Windows allow local attackers to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse (1) shfolder.dll, (2) ntmarta.dll, (3) secur32.dll or (4) dwmapi.dll file in the current working directory.

Frequently asked questions

What is CVE-2017-11157?: Multiple untrusted search path vulnerabilities in the installer in Synology Cloud Station Backup before 4.2.5-4396 on Windows allow local attackers to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse (1) shfolder.dll, (2) ntmarta.dll, (3) secur32.dll or (4) dwmapi.dll file in the current working directory.
How severe is CVE-2017-11157?: CVE-2017-11157 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11157 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11157?: CVE-2017-11157 affects Synology Cloud Station Backup. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-11157?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-11157 published?: CVE-2017-11157 was published on 2017-08-30 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/support/security/Synology_SA_17_50_Cloud_Station_Backup

Affected products (1)

cpe:2.3:a:synology:cloud_station_backup:*:*:*:*:*:*:*:*

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