How severe is CVE-2019-9951?

CVE-2019-9951 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9951 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9951?

CVE-2019-9951 primarily affects Western Digital My Cloud Mirror Gen 2 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-9951?

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-2019-9951 published?

CVE-2019-9951 was published on 2019-04-24 and last updated on 2026-06-17.

CVE-2019-9951

CVE-2019-9951 is a critical-severity vulnerability in Western Digital My Cloud Mirror Gen 2 Firmware with a CVSS 3.x base score of 9.8. 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-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Western Digital My Cloud Mirror Gen 2 Firmware
Published: 2019-04-24
Last modified: 2026-06-17

Description

Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100, My Cloud DL4100, My Cloud PR2100 and My Cloud PR4100 firmware before 2.31.174 is affected by an unauthenticated file upload vulnerability. The page web/jquery/uploader/uploadify.php can be accessed without any credentials, and allows uploading arbitrary files to any location on the attached storage.

Frequently asked questions

What is CVE-2019-9951?: Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100, My Cloud DL4100, My Cloud PR2100 and My Cloud PR4100 firmware before 2.31.174 is affected by an unauthenticated file upload vulnerability. The page web/jquery/uploader/uploadify.php can be accessed without any credentials, and allows uploading arbitrary files to any location on the attached storage.
How severe is CVE-2019-9951?: CVE-2019-9951 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-9951 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9951?: CVE-2019-9951 primarily affects Western Digital My Cloud Mirror Gen 2 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-9951?: 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-2019-9951 published?: CVE-2019-9951 was published on 2019-04-24 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:o:western_digital:my_cloud_mirror_gen_2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_ex2_ultra_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_ex2100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_ex4100:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_dl2100:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_dl4100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_pr2100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_pr4100:*:*:*:*:*:*:*:*
cpe:2.3:o:western_digital:my_cloud_firmware:*:*:*:*:*:*:*:*

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