CVE-2023-33851: IBM PowerVM Hypervisor FW950.00 through FW950.90, FW1020.00 through FW1020.40, and FW1030.00 through FW1030.30

Q: How do I fix CVE-2023-33851?

powervm hypervisor: upgrade to newer than fw1030.30. Exact commands for each OS are on this page.

Q: Is CVE-2023-33851 being exploited?

CVE-2023-33851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-33851 affect?

CVE-2023-33851 affects powervm hypervisor. Severity is medium (CVSS 5.3). IBM PowerVM Hypervisor FW950.00 through FW950.90, FW1020.00 through FW1020.40, and FW1030.00 through FW1030.30 could reveal sensitive partition data to a system administrator. IBM X-Force ID: 257135.

Q: How urgent is CVE-2023-33851?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2023-33851 is a medium-severity flaw (CVSS 5.3) affecting powervm hypervisor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM PowerVM Hypervisor FW950.00 through FW950.90, FW1020.00 through FW1020.40, and FW1030.00 through FW1030.30 could reveal sensitive partition data to a system administrator. IBM X-Force ID: 257135.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-200
Published	2024-02-04
Last modified	2026-06-17

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-04 01:15 UTCPublished CVE record published
2026-06-17 06:02 UTCUpdated Record last modified

ibm powervm hypervisor UPGRADE

Affected: >= fw950 and <= fw950.90 · >= fw1020.00 and <= fw1020.40 · >= fw1030.00 and <= fw1030.30

Fixed in: newer than fw1030.30

Safe to downgrade to: a release before fw950

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-33851?

powervm hypervisor: upgrade to newer than fw1030.30. Exact commands for each OS are on this page.

Is CVE-2023-33851 being exploited?

CVE-2023-33851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-33851 affect?

CVE-2023-33851 affects powervm hypervisor. Severity is medium (CVSS 5.3). IBM PowerVM Hypervisor FW950.00 through FW950.90, FW1020.00 through FW1020.40, and FW1030.00 through FW1030.30 could reveal sensitive partition data to a system administrator. IBM X-Force ID: 257135.

How urgent is CVE-2023-33851?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2025-36238 MEDIUM 6.0 MITIGATE IBM PowerVM Hypervisor FW1110.00 through FW1110.03, FW1060.00 through FW1060.51, and FW950.00 through FW950.F0
CVE-2025-36194 LOW 2.8 MITIGATE IBM PowerVM Hypervisor FW1110.00 through FW1110.03, FW1060.00 through FW1060.51, and FW950.00 through FW950.F0
CVE-2025-36035 MEDIUM 6.7 UPGRADE IBM PowerVM Hypervisor FW950.00 through FW950.E0, FW1050.00 through FW1050.50, and FW1060.00 through FW1060.40
CVE-2025-0986 MEDIUM 4.5 UPGRADE IBM PowerVM Hypervisor FW1050.00 through FW1050.30 and FW1060.00 through FW1060.20 could allow a local user, u
CVE-2024-41781 MEDIUM 5.1 UPGRADE IBM PowerVM Platform KeyStore (IBM PowerVM Hypervisor FW950.00 through FW950.90, FW1030.00 through FW1030.60,

References

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