How severe is CVE-2021-38923?

CVE-2021-38923 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-38923 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38923?

CVE-2021-38923 affects Ibm Powervm Hypervisor Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38923?

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

When was CVE-2021-38923 published?

CVE-2021-38923 was published on 2021-10-06 and last updated on 2026-06-17.

CVE-2021-38923

CVE-2021-38923 is a critical-severity vulnerability in Ibm Powervm Hypervisor Firmware with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ibm Powervm Hypervisor Firmware
Published: 2021-10-06
Last modified: 2026-06-17

Description

IBM PowerVM Hypervisor FW1010 could allow a privileged user to gain access to another VM due to assigning duplicate WWPNs. IBM X-Force ID: 210162.

Frequently asked questions

What is CVE-2021-38923?: IBM PowerVM Hypervisor FW1010 could allow a privileged user to gain access to another VM due to assigning duplicate WWPNs. IBM X-Force ID: 210162.
How severe is CVE-2021-38923?: CVE-2021-38923 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-38923 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38923?: CVE-2021-38923 affects Ibm Powervm Hypervisor Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38923?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-38923 published?: CVE-2021-38923 was published on 2021-10-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:ibm:powervm_hypervisor_firmware:1010:*:*:*:*:*:*:*