CVE-2019-12491: OnApp before 5.0.0-88, 5.5.0-93, and 6.0.0-196 allows an attacker to run arbitrary commands with root privileg

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MEDIUM 6.6DOWNGRADE

CVE-2019-12491 is a medium-severity flaw (CVSS 6.6) affecting onapp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OnApp before 5.0.0-88, 5.5.0-93, and 6.0.0-196 allows an attacker to run arbitrary commands with root privileges on servers managed by OnApp for XEN/KVM hypervisors. To exploit the vulnerability an attacker has to have control of a single server on a given cloud (e.g. by renting one). From the source server, the attacker can craft any command and trigger the OnApp platform to execute that command with root privileges on a target server.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Published	2019-06-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: onapp

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

Am I affected?

Timeline

2019-06-19 16:15 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

onapp onapp DOWNGRADE

Affected: 5.0.0 · 5.0.0 update_79 · 5.0.0 update_82 · 5.0.0 update_83 · 5.0.0 update_87 · 5.1.0 · 5.1.0 update_16 · 5.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison onapp sudo apt install onapp=<VERSION_BEFORE_5.0.0> sudo apt-mark hold onapp

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

dnf --showduplicates list onapp sudo dnf downgrade onapp-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add onapp

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-2019-12491?

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

Is CVE-2019-12491 being exploited?

CVE-2019-12491 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-2019-12491 affect?

CVE-2019-12491 affects onapp. Severity is medium (CVSS 6.6). OnApp before 5.0.0-88, 5.5.0-93, and 6.0.0-196 allows an attacker to run arbitrary commands with root privileges on servers managed by OnApp for XEN/KVM hypervisors. To exploit the vulnerability an attacker has to have control of a single s

How urgent is CVE-2019-12491?

Priority 42/100. No elevated risk signals yet.

Software pages

Xen vulnerabilities

References

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