How severe is CVE-2017-18856?

CVE-2017-18856 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-18856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-18856?

CVE-2017-18856 affects Netgear Readynas Os Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-18856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-18856 published?

CVE-2017-18856 was published on 2020-04-29 and last updated on 2026-06-17.

CVE-2017-18856

CVE-2017-18856 is a medium-severity vulnerability in Netgear Readynas Os Firmware with a CVSS 3.x base score of 6.7. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
CVSS v2: 4.6
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Netgear Readynas Os Firmware
Published: 2020-04-29
Last modified: 2026-06-17

Description

NETGEAR ReadyNAS devices before 6.6.1 are affected by command injection.

Frequently asked questions

What is CVE-2017-18856?: NETGEAR ReadyNAS devices before 6.6.1 are affected by command injection.
How severe is CVE-2017-18856?: CVE-2017-18856 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-18856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-18856?: CVE-2017-18856 affects Netgear Readynas Os Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-18856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-18856 published?: CVE-2017-18856 was published on 2020-04-29 and last updated on 2026-06-17.

References

https://kb.netgear.com/000044333/Security-Advisory-for-Operating-System-Command-Injection-on-ReadyNAS-OS-6-Storage-Systems-PSV-2017-2002

Affected products (1)

cpe:2.3:o:netgear:readynas_os_firmware:*:*:*:*:*:*:*:*

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