CVE-2020-25637: A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for re

Q: How do I fix CVE-2020-25637?

libvirt: upgrade to 6.8.0; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-25637 being exploited?

CVE-2020-25637 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-25637 affect?

CVE-2020-25637 affects libvirt, leap. Severity is medium (CVSS 6.7). A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specif

Q: How urgent is CVE-2020-25637?

Priority 40/100. On your watchlist

This month

MEDIUM 6.7WATCHLISTUPGRADEMITIGATE

CVE-2020-25637 is a medium-severity flaw (CVSS 6.7) affecting libvirt, leap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on th

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-415
Published	2020-10-06
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2020-10-06 14:15 UTCPublished CVE record published
2026-06-17 03:07 UTCUpdated Record last modified

redhat libvirt UPGRADE

Affected: < 6.8.0

Fixed in: 6.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 6.8.0 (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.

opensuse leap MITIGATE

Affected: 15.1 · 15.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.1

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-2020-25637?

libvirt: upgrade to 6.8.0; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-25637 being exploited?

CVE-2020-25637 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-2020-25637 affect?

CVE-2020-25637 affects libvirt, leap. Severity is medium (CVSS 6.7). A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specif

How urgent is CVE-2020-25637?

Priority 40/100. On your watchlist

Software pages

QEMU vulnerabilities

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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