CVE-2021-3559: A flaw was found in libvirt in the virConnectListAllNodeDevices API in versions before 7.0.0

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MEDIUM 6.5WATCHLISTUPGRADEMITIGATE

CVE-2021-3559 is a medium-severity flaw (CVSS 6.5) affecting libvirt, ontap select deploy administration utility. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in libvirt in the virConnectListAllNodeDevices API in versions before 7.0.0. It only affects hosts with a PCI device and driver that supports mediated devices (e.g., GRID driver). This flaw could be used by an unprivileged client with a read-only connection to crash the libvirt daemon by executing the 'nodedev-list' virsh command. The highest threat from this vulnerability is to system availability.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-119
Published	2021-05-24
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: netapp · redhat

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

Am I affected?

Timeline

2021-05-24 12:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

redhat libvirt UPGRADE

Affected: >= 6.10.0 and < 7.0.0

Fixed in: 7.0.0

Safe to downgrade to: a release before 6.10.0

1. Check installed version

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

2. UPGRADE to 7.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libvirt

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libvirt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.10.0 (Debian / Ubuntu)

apt-cache madison libvirt sudo apt install libvirt=<VERSION_BEFORE_6.10.0> sudo apt-mark hold libvirt

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libvirt sudo dnf downgrade libvirt-<VERSION_BEFORE_6.10.0> sudo dnf versionlock add libvirt

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.

netapp ontap select deploy administration utility MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ontap-select-deploy-administration-utility || rpm -q ontap-select-deploy-administration-utility || ontap-select-deploy-administration-utility --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2021-3559?

libvirt: upgrade to 7.0.0; ontap select deploy administration utility: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3559 being exploited?

CVE-2021-3559 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-2021-3559 affect?

CVE-2021-3559 affects libvirt, ontap select deploy administration utility. Severity is medium (CVSS 6.5). A flaw was found in libvirt in the virConnectListAllNodeDevices API in versions before 7.0.0. It only affects hosts with a PCI device and driver that supports mediated devices (e.g., GRID driver). This flaw could be used by an unprivileged

How urgent is CVE-2021-3559?

Priority 44/100. On your watchlist

Related CVEs

CVE-2024-8235 MEDIUM 6.2 UPGRADE A flaw was found in libvirt
CVE-2024-2496 MEDIUM 5.0 UPGRADE MITIGATE A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt
CVE-2023-3750 MEDIUM 6.5 MITIGATE MITIGATE A flaw was found in libvirt
CVE-2023-2700 MEDIUM 5.5 DOWNGRADE MITIGATE A vulnerability was found in libvirt
CVE-2022-0897 MEDIUM 4.3 UPGRADE MITIGATE A flaw was found in the libvirt nwfilter driver

References

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