How severe is CVE-2021-45464?

CVE-2021-45464 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45464 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45464?

CVE-2021-45464 affects Kvmtool Project Kvmtool. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45464?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-45464 published?

CVE-2021-45464 was published on 2023-04-15 and last updated on 2026-06-17.

CVE-2021-45464

CVE-2021-45464 is a high-severity vulnerability in Kvmtool Project Kvmtool with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Kvmtool Project Kvmtool
Published: 2023-04-15
Last modified: 2026-06-17

Description

kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and virtio/pci.c. This allows a guest OS user to execute arbitrary code on the host machine.

Frequently asked questions

What is CVE-2021-45464?: kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and virtio/pci.c. This allows a guest OS user to execute arbitrary code on the host machine.
How severe is CVE-2021-45464?: CVE-2021-45464 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45464 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45464?: CVE-2021-45464 affects Kvmtool Project Kvmtool. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45464?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-45464 published?: CVE-2021-45464 was published on 2023-04-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kvmtool_project:kvmtool:-:*:*:*:*:*:*:*

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