CVE-2026-16687: CWE-121 Stack-based Buffer Overflow in IBM Power Systems Firmware
Description
CVE-2026-16687 is a critical stack-based buffer overflow vulnerability in the ASMI web interface of IBM Power Systems Firmware. It affects multiple firmware versions including FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2. An unauthenticated attacker with network access can send a malformed request to the FSP, leading to arbitrary code execution and full control over the managed system. This results in a complete compromise of confidentiality, integrity, and availability.
CVSS v3.1
Score 9.6critical
Affected software
IBM
Power Systems Firmware
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-121) exists in the ASMI web interface of IBM Power Systems Firmware versions FW1120.00, FW1110.00 to FW1110.30, FW1060.00 to FW1060.80, and FW950.00 to FW950.H2. An unauthenticated attacker with network access can exploit a stack-based buffer overflow by sending a malformed request to the Flexible Service Processor (FSP). Successful exploitation allows arbitrary code execution, granting the attacker full control over the managed system. The CVSS v3.1 base score is 9.6, reflecting critical impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated remote attacker to execute arbitrary code on the FSP, resulting in full control over the managed IBM Power System. This compromises confidentiality, integrity, and availability of the system, potentially leading to complete system takeover.
Mitigation Recommendations
No patch or remediation information is currently provided. Patch status is not yet confirmed — check the IBM vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the ASMI web interface to trusted administrators only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-23T00:09:08.103Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a85feffacd9273b497e9300
Added to database: 08/19/2026, 19:07:43 UTC
Last enriched: 09/11/2026, 07:02:06 UTC
Last updated: 10/04/2026, 10:02:25 UTC
Views: 45
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