CVE-2026-18857
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Buffer Overflow in IBM OpenBMC Firmware

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: IBM Corporation

Description
IBM OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affected by a vulnerability in the BMC firmware management interface. The host system can cause the BMC firmware management service to crash or allow a limited amount of BMC internal memory to be read, resulting in a confidentiality and availability impact to the managed system.

CVSS Scores

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-18857
EUVD
EUVD-2026-85893

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
ibm openbmc From FW1120.00 (inc) to FW1120.01 (inc)
ibm openbmc From FW1110.00 (inc) to FW1110.31 (inc)
ibm openbmc From FW1060.00 (inc) to FW1060.81 (inc)
ibm openbmc From fw1120.00 (inc) to fw1120.01 (inc)
ibm openbmc From fw1110.00 (inc) to fw1110.31 (inc)
ibm openbmc From fw1060.00 (inc) to fw1060.81 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This vulnerability affects IBM Power Systems firmware in the BMC (Baseboard Management Controller) firmware management interface. It allows a host system to crash the BMC service or read a limited amount of BMC internal memory, causing confidentiality and availability impacts on the managed system.

Detection Guidance

Detection of this vulnerability requires checking the BMC firmware version on IBM Power Systems. Use the IBM Power System firmware management tools or commands like 'bmcversion' or 'ipmitool fru' to verify the firmware version. Compare the output against the affected versions (FW1120.00-FW1120.01, FW1110.00-FW1110.31, FW1060.00-FW1060.81).

Impact Analysis

The vulnerability can lead to system crashes or unauthorized memory access on the BMC, potentially disrupting operations and exposing sensitive data. However, the CVSS score of 3.4 indicates low severity, meaning the impact is limited.

Compliance Impact

The vulnerability may impact compliance with GDPR and HIPAA due to potential confidentiality breaches from unauthorized memory reads and availability issues from service crashes. Unauthorized access to BMC internal memory could expose sensitive data, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information.

Mitigation Strategies

Update the BMC firmware to the latest versions: FW1120.02(1120_195), FW1110.32(1110_160), or FW1060.82(1060_199) depending on your Power System model. Download firmware only from trusted sources like IBM Fix Central.

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