How severe is CVE-2021-32843?

CVE-2021-32843 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-32843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32843?

CVE-2021-32843 affects Mobyproject Hyperkit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32843?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-32843 published?

CVE-2021-32843 was published on 2023-02-17 and last updated on 2026-06-17.

CVE-2021-32843

CVE-2021-32843 is a medium-severity vulnerability in Mobyproject Hyperkit with a CVSS 3.x base score of 6.2. 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-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.2)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Mobyproject Hyperkit
Published: 2023-02-17
Last modified: 2026-06-17

Description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, `virtio.c` has is a call to `vc_cfgread` that does not check for null which when called makes the host crash. This issue may lead to a guest crashing the host causing a denial of service. This issue is fixed in commit df0e46c7dbfd81a957d85e449ba41b52f6f7beb4.

Frequently asked questions

What is CVE-2021-32843?: HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, `virtio.c` has is a call to `vc_cfgread` that does not check for null which when called makes the host crash. This issue may lead to a guest crashing the host causing a denial of service. This issue is fixed in commit df0e46c7dbfd81a957d85e449ba41b52f6f7beb4.
How severe is CVE-2021-32843?: CVE-2021-32843 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-32843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32843?: CVE-2021-32843 affects Mobyproject Hyperkit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32843?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-32843 published?: CVE-2021-32843 was published on 2023-02-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:*

More vulnerabilities in Mobyproject Hyperkit

CVE-2021-32846 — High (CVSS 7.7): HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function…
CVE-2021-32845 — High (CVSS 7.7): HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of…
CVE-2021-32847 — High (CVSS 7.1): HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior, a…
CVE-2021-32844 — Medium (CVSS 6.2): HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of…

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