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 the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Conclusion & alert: CVE-2020-25637 is rated Moderate Risk (41.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.52%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.10% | 0.52% | +0.42% |
| 2 | 2025-11-21 | 0.18% | 0.10% | -0.08% |
| 3 | 2025-11-18 | — | 0.18% | — |
Full EPSS history (14 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.7 | 3.1 | MEDIUM |
|
0.8 | 5.9 | [email protected] |
| 7.2 | 2.0 | HIGH |
|
3.9 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2020-25637: 1 source package rows (libvirt); 15 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 9, open 6. | https://security.alpinelinux.org/vuln/CVE-2020-25637 |
debian
|
not yet assigned | CVE-2020-25637 not yet assigned priority: Debian including 1 source packages (libvirt), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2020-25637 |
gentoo
|
low | CVE-2020-25637: 1 GLSA(s) (202210-06), 2 atom(s) (app-emulation/libvirt, dev-python/libvirt-python); latest impact low. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-25637 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2020-25637 |
suse
|
high | CVE-2020-25637 severity important: SUSE including 850 source package names (0.38.1:libvirt-client-6.0.0-13.8.1, 0.38.1:libvirt-daemon-6.0.0-13.8.1, …), 1522 product×package rows across 70 product lines (Container suse/sles/15.2/virt-handler, Container suse/sles/15.2/virt-launcher, … (70 product lines)): Fixed 1287, Known Affected 231, Known Not Affected 4. | https://www.suse.com/security/cve/CVE-2020-25637/ |
ubuntu
|
negligible | CVE-2020-25637 negligible priority: Ubuntu including 1 source packages (libvirt), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 10, released 3, needed 2, ignored 1. | https://ubuntu.com/security/CVE-2020-25637 |
| URL | Tags |
|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00072.html | Mailing List Third Party Advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00073.html | Mailing List Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1881037 | Issue Tracking Patch Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html | |
| https://security.gentoo.org/glsa/202210-06 | Third Party Advisory |