Auth bypass in Kubevirt
CVE-2025-64434
KubeVirt is a virtual machine management add-on for Kubernetes. Prior to 1.5.3 and 1.6.1, due to the peer verification logic in virt-handler (via verifyPeerCert), an attacker who compromises a virt-handler instance, could exploit these shared credentials to impersonate virt-api and execute privileged operations against other virt-handler instances potentially compromising the integrity and availability of the VM managed by it. This vulnerability is fixed in 1.5.3 and 1.6.1.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Kubevirt — versions >= 1.6.0-alpha.0, < 1.6.1, < 1.5.3, 1.6.0
Weakness classification (CWE)
References
- github.com/kubevirt/kubevirt/security/advisories/GHSA-ggp9-c99x-54gp (Exploit, Vendor Advisory)
- github.com/kubevirt/kubevirt/commit/231dc69723f331dc02f65a31ab4c3d6869f40d6a (Patch)
- github.com/kubevirt/kubevirt/commit/af2f08a9a186eccc650f87c30ab3e07b669e8b5b (Patch)
- github.com/kubevirt/kubevirt/commit/b9773bc588e6e18ece896a2dad5336ef7a653074 (Patch)
Frequently asked questions
- What is CVE-2025-64434?
- CVE-2025-64434 is a medium-severity vulnerability in Kubevirt, classified under Improper Authentication. CVSS score: 4.7/10. Published 2025-11-07.
- How severe is CVE-2025-64434?
- Medium severity. CVSS v3 base score is 4.7 out of 10.