CVE-2019-18931: Western Digital My Cloud EX2 Ultra firmware 2.31.195 allows a Buffer Overflow with Extended Instruction Pointe

This month

HIGH 8.8MITIGATE

CVE-2019-18931 is a high-severity flaw (CVSS 8.8) affecting my cloud ex2 ultra firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Western Digital My Cloud EX2 Ultra firmware 2.31.195 allows a Buffer Overflow with Extended Instruction Pointer (EIP) control via crafted GET/POST parameters.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-120
Published	2019-11-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: western digital

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

Am I affected?

Timeline

2019-11-13 16:15 UTCPublished CVE record published
2026-06-17 02:25 UTCUpdated Record last modified

western digital my cloud ex2 ultra firmware MITIGATE

Affected: 2.31.195

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.31.195

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-2019-18931?

my cloud ex2 ultra firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-18931 being exploited?

CVE-2019-18931 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-2019-18931 affect?

CVE-2019-18931 affects my cloud ex2 ultra firmware. Severity is high (CVSS 8.8). Western Digital My Cloud EX2 Ultra firmware 2.31.195 allows a Buffer Overflow with Extended Instruction Pointer (EIP) control via crafted GET/POST parameters.

How urgent is CVE-2019-18931?

Priority 56/100. High severity; Public exploit reference

Software pages

Western Digital vulnerabilities

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References

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