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CVE-2019-9951: Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud

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CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2019-9951 is a critical-severity flaw (CVSS 9.8) affecting my cloud mirror gen 2 firmware, my cloud ex2 ultra firmware, my cloud ex2100 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.7% (top 23%)
CISA exploited listNo
WeaknessCWE-434
Published2019-04-24
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: western digital

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

western digital my cloud mirror gen 2 firmware UPGRADE
Affected: < 2.31.174
Fixed in: 2.31.174
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
western digital my cloud ex2 ultra firmware UPGRADE
Affected: < 2.31.174
Fixed in: 2.31.174
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
western digital my cloud ex2100 firmware UPGRADE
Affected: < 2.31.174
Fixed in: 2.31.174
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
western digital my cloud ex4100 UPGRADE
Affected: < 2.31.174
Fixed in: 2.31.174
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
western digital my cloud dl2100 UPGRADE
Affected: < 2.31.174
Fixed in: 2.31.174
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
western digital my cloud dl4100 firmware UPGRADE
Affected: < 2.31.174
Fixed in: 2.31.174
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-9951?

my cloud mirror gen 2 firmware: upgrade to 2.31.174; my cloud ex2 ultra firmware: upgrade to 2.31.174; my cloud ex2100 firmware: upgrade to 2.31.174. Exact commands for each OS are on this page.

Is CVE-2019-9951 being exploited?

CVE-2019-9951 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-9951 affect?

CVE-2019-9951 affects my cloud mirror gen 2 firmware, my cloud ex2 ultra firmware, my cloud ex2100 firmware. Severity is critical (CVSS 9.8). 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 uplo

How urgent is CVE-2019-9951?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities · Western Digital vulnerabilities · jQuery vulnerabilities

Related CVEs

References

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