EUVD-2026-62633
GHSA-7w87-459r-rfjg
Severity by source
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Service-level BMC/FSP access mandates PR:H and AV:L; scope change to host firmware justifies S:C with full C/I/A.
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM Power Firmware FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 - OP940.81 (Power HMC) is affected by a vulnerability in host firmware configuration parsing. An attacker with service-level access to the BMC/FSP can supply specially crafted configuration data, compromising the host firmware boot stage and everything subsequently loaded by it, resulting in a confidentiality, integrity, and availability impact to the managed system.
AnalysisAI
Stack-based buffer overflow in IBM Power Firmware's host firmware configuration parser allows an attacker with service-level access to the BMC/FSP to supply specially crafted configuration data, triggering CWE-121 during the firmware boot stage and compromising the entire software stack loaded thereafter. Affected firmware spans multiple major release trains - FW1120, FW1110, FW1060, FW950, and OP940 - covering Power9 and Power HMC managed systems. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires service-level access to the BMC/FSP management interface of an IBM Power system running one of the affected firmware versions. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.2 score reflects a Scope Changed scenario with full C/H/I/H/A/H impact, but the gating factor is PR:H - service-level access to the BMC/FSP, which is a significant prerequisite that substantially narrows the realistic attacker population. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply the firmware updates provided by IBM, documented at https://www.ibm.com/support/pages/node/7283239. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all IBM Power systems currently deployed and document which firmware versions are running. …
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More in Power Firmware
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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