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From The CircuitryVerified tech news, cross-checked.How we verify →
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Fact-check summary

CVETodo and OpenCVE report the IBM Power firmware CVE-2026-93306 ASMI flaw with matching details on affected ranges and impact, published September 25.

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Home/Security/IBM Power Server Firmware Flaw CVE-2026-93306 Can Crash the ASMI Web Interface
VERIFIEDBy Xavier Rivera·Friday, September 25, 2026 at 4:00 PM AST·1 min read

IBM Power Server Firmware Flaw CVE-2026-93306 Can Crash the ASMI Web Interface

CVE-2026-93306, published by NVD on September 25, lets an unauthenticated attacker on the management network crash the ASMI web server in IBM server firmware with a malformed HTTPS request. IBM rates it 7.1 (High) and has released fixed firmware for Power11, Power10 and Power9 systems.

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IBM Power Server Firmware Flaw CVE-2026-93306 Can Crash the ASMI Web Interface
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TL;DRAI · 60 sec read

IBM server firmware has a high-severity flaw, CVE-2026-93306 (CVSS 7.1), in the ASMI web interface. An unauthenticated attacker on the management network can crash the ASMI web server with a malformed HTTPS request; repeated attacks could cause a sustained loss of access to ASMI. Affected lines are FW1120.00–FW1120.01, FW1110.00–FW1110.31, FW1060.00–FW1060.81 and FW950.00–FW950.H3. IBM lists FW1120.02, FW1110.32, FW1060.82 and FW950.H4 or newer as fixes.

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IBM has released firmware updates for IBM Power servers to fix CVE-2026-93306, a high-severity flaw in the ASMI web interface of its Power Systems server firmware. NVD published the record on September 25.

A malformed HTTPS request can crash the ASMI web server. An unauthenticated attacker on the management network can send a malformed HTTPS request to ASMI, causing the web server to crash with possible memory corruption and generate an error log. ASMI restarts automatically, but repeated exploitation could result in a sustained loss of access to the management interface. IBM scores the flaw 7.1 (High) on CVSS 3.1 and classifies it as CWE-125, an out-of-bounds read.
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Four firmware lines are affected. The vulnerable ranges are FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3.

IBM lists fixed builds by server generation. For the Power11 E1180 (9080-HEU), IBM says to install FW1120.02 (1120_171), FW1110.32 (1110_138) or newer. For the Power10 E1080 (9080-HEX), the fix is FW1060.82 (1060_189) or newer. Power9 systems, including the S922, H922, S914, S924, H924, E950 and E980, need FW950.H4 (950_236) or newer. The images are on IBM Fix Central.
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As a mitigation, IBM advises operating the network interface on a private network or behind a firewall. The CVSS vector rates the attack as adjacent-network, with no privileges or user interaction required.
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