CVE-2019-9945: SoftNAS Cloud 4.2.0 and 4.2.1 allows remote command execution

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-9945 is a critical-severity flaw (CVSS 9.8) affecting cloud. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SoftNAS Cloud 4.2.0 and 4.2.1 allows remote command execution. The NGINX default configuration file has a check to verify the status of a user cookie. If not set, a user is redirected to the login page. An arbitrary value can be provided for this cookie to access the web interface without valid user credentials. If customers have not followed SoftNAS deployment best practices and expose SoftNAS StorageCenter ports directly to the internet, this v

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.8% (top 7%)
CISA exploited list	No
Published	2019-03-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: softnas

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

Am I affected?

Timeline

2019-03-23 16:29 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

softnas cloud DOWNGRADE

Affected: 4.2.0 · 4.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.0

1. Check installed version

apt-cache policy cloud || rpm -q cloud || cloud --version

2. No fixed release: DOWNGRADE to a release before 4.2.0 (Debian / Ubuntu)

apt-cache madison cloud sudo apt install cloud=<VERSION_BEFORE_4.2.0> sudo apt-mark hold cloud

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cloud sudo dnf downgrade cloud-<VERSION_BEFORE_4.2.0> sudo dnf versionlock add cloud

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2019-9945?

cloud: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-9945 being exploited?

CVE-2019-9945 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-2019-9945 affect?

CVE-2019-9945 affects cloud. Severity is critical (CVSS 9.8). SoftNAS Cloud 4.2.0 and 4.2.1 allows remote command execution. The NGINX default configuration file has a check to verify the status of a user cookie. If not set, a user is redirected to the login page. An arbitrary value can be provided fo

How urgent is CVE-2019-9945?

Priority 63/100. Critical severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

nginx vulnerabilities

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References

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