How severe is CVE-2021-32844?

CVE-2021-32844 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-2021-32844 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-2021-32844?

CVE-2021-32844 affects Mobyproject Hyperkit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32844?

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

When was CVE-2021-32844 published?

CVE-2021-32844 was published on 2023-02-17 and last updated on 2026-06-17.

CVE-2021-32844

CVE-2021-32844 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, ` vi_pci_write` has is a call to `vc_cfgwrite` 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 451558fe8aaa8b24e02e34106e3bb9fe41d7ad13.

Frequently asked questions

What is CVE-2021-32844?: HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, ` vi_pci_write` has is a call to `vc_cfgwrite` 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 451558fe8aaa8b24e02e34106e3bb9fe41d7ad13.
How severe is CVE-2021-32844?: CVE-2021-32844 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-2021-32844 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-2021-32844?: CVE-2021-32844 affects Mobyproject Hyperkit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32844?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-32844 published?: CVE-2021-32844 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-2021-32843 — Medium (CVSS 6.2): HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of…

All CVEs affecting Mobyproject Hyperkit →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →