What is CVE-2023-30612?

CVE-2023-30612 is a medium-severity vulnerability in Cloud-Hypervisor, classified under Missing Authentication for Critical Function. CVSS score: 4.0/10. Published 2023-04-19.

How severe is CVE-2023-30612?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Auth bypass in Cloud-Hypervisor

CVE-2023-30612

Cloud hypervisor is a Virtual Machine Monitor for Cloud workloads. This vulnerability allows users to close arbitrary open file descriptors in the Cloud Hypervisor process via sending malicious HTTP request through the HTTP API socket. As a result, the Cloud Hypervisor process can be easily crashed, causing Deny-of-Service (DoS). This can also be a potential Use-After-Free (UAF) vulnerability. Users require to have the write access to the API socket file to trigger this vulnerability. Impacted versions of Cloud Hypervisor include upstream main branch, v31.0, and v30.0. The vulnerability was initially detected by our `http_api_fuzzer` via oss-fuzz. This issue has been addressed in versions 30.1 and 31.1. Users unable to upgrade may mitigate this issue by ensuring the write access to the API socket file is granted to trusted users only.

Vulnerability class: Broken Authentication

Published 2023-04-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (27.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Cloud-Hypervisor — versions >= 30.0, < 30.1, >= 31.0, < 31.1
Cloudhypervisor Cloud Hypervisor — versions 30.0, 31.1

Weakness classification (CWE)

References

github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-g6mw-f26h… (Patch, Vendor Advisory)
github.com/cloud-hypervisor/cloud-hypervisor/pull/5350 (Patch)
github.com/cloud-hypervisor/cloud-hypervisor/pull/5373 (Patch)
oss-fuzz.com/testcase-detail/5260873569796096 (Permissions Required)
oss-fuzz.com/testcase-detail/5426283514560512 (Permissions Required)

Frequently asked questions

What is CVE-2023-30612?: CVE-2023-30612 is a medium-severity vulnerability in Cloud-Hypervisor, classified under Missing Authentication for Critical Function. CVSS score: 4.0/10. Published 2023-04-19.
How severe is CVE-2023-30612?: Medium severity. CVSS v3 base score is 4.0 out of 10.