Unauthenticated IPMI sessions via default key reuse
Published Sep 15, 2026 · Updated Sep 15, 2026
Authentication bypass in OpenBMC phosphor-net-ipmid allows remote attackers to establish IPMI sessions without valid credentials. The RAKP Message 1 handler can return before replacing the authentication object's constructor defaults, so Message 3 validation uses the constant 20-byte userKey derived from 0penBmc and a stale, often predictable bmcRandomNum. Network access to the RMCP+ service is sufficient, and successful exploitation grants an authenticated management session.
Summary
What happened
Authentication bypass in OpenBMC phosphor-net-ipmid allows remote attackers to establish IPMI sessions without valid credentials. The RAKP Message 1 handler can return before replacing the authentication object's constructor defaults, so Message 3 validation uses the constant 20-byte userKey derived from 0penBmc and a stale, often predictable bmcRandomNum. Network access to the RMCP+ service is sufficient, and successful exploitation grants an authenticated management session.
The record
- CVE
- CVE-2026-16141
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- OpenBMC
- Product
- phosphor-net-ipmid
- Classifications
- T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=0 <=ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361
What conditions does exploitation require?
What is affected?
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Attacks
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Technologies
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