Firmware vulnerability allows BMC/FSP users to read/write host memory and fully control hosts/partitions on enterprise IBM Power servers, risking widespread operational disruption.
CVE-2026-16933
BMC firmware flaw enables full host compromise on IBM Power Systems.
Is CVE-2026-16933 being exploited?
Not confirmed. CVE-2026-16933 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.12% probability of exploitation in the next 30 days.
How severe is CVE-2026-16933?
CVE-2026-16933 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-16933?
Yes. A fix has been recorded for CVE-2026-16933. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16933 affect?
CVE-2026-16933 affects IBM Power Systems Firmware FW1120.00, FW1110.00 - FW1110.30, FW1060.00 - FW1060.80, FW950.00 - FW950.H2, and 3 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16933?
Restrict/segregate BMC access, enforce MFA, monitor for suspicious activity, and apply vendor patches/mitigations when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
An attacker with BMC/FSP service or root access can read/write host memory, gaining full control of host and all partitions (confidentiality, integrity, availability).
Immediate action required
- affectedFW1120.00
- affected>= FW1110.00 and <= FW1110.30
- affected>= FW1060.00 and <= FW1060.80
- affected>= FW950.00 and <= FW950.H2
- affected>= OP940.00 and <= OP940.a1
- affected>= OP940.00 and <= OP940.81
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.