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4 vulnerabilities found for phosphor-net-ipmid by OpenBMC
CVE-2026-16141 (GCVE-0-2026-16141)
Vulnerability from nvd – Published: 2026-09-15 13:57 – Updated: 2026-09-15 14:59
VLAI
EPSS
VEX
Title
OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value
Summary
OpenBMC's IPMI implementation, phosphor-net-ipmid, contains a logic flaw in which an unauthenticated client can force the RAKP Message 1 handler to return before it overwrites the authentication object's constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte 'userKey' initialized from the string '0penBmc' and an often-predictable 'bmcRandomNum'. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 14:59 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.runzero.com/advisories/openbmc-ipmi-a… | third-party-advisory |
| https://www.runzero.com/blog/lights-out-exposed/ | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenBMC | phosphor-net-ipmid |
Affected:
0 , ≤ ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361
(git)
|
Date Public
2026-09-15 14:00
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CVE-2026-16140 (GCVE-0-2026-16140)
Vulnerability from nvd – Published: 2026-09-15 13:57 – Updated: 2026-09-15 15:00
VLAI
EPSS
VEX
Title
OpenBMC IPMI Privilege Escalation via Retargeted RAKP 1
Summary
OpenBMC's IPMI implementation, phosphor-net-ipmid, is vulnerable to a logic flaw where the authorization context of an existing session can be replaced with a target account while still maintaining the original integrity and encryption keys. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C. This issue effectively allows for privilege escalation without re-authentication.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 15:00 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.runzero.com/advisories/openbmc-ipmi-p… | third-party-advisory |
| https://www.runzero.com/blog/lights-out-exposed/ | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenBMC | phosphor-net-ipmid |
Affected:
0 , ≤ ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361
(git)
|
Date Public
2026-09-15 14:00
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CVE-2026-16141 (GCVE-0-2026-16141)
Vulnerability from cvelistv5 – Published: 2026-09-15 13:57 – Updated: 2026-09-15 14:59
VLAI
EPSS
VEX
Title
OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value
Summary
OpenBMC's IPMI implementation, phosphor-net-ipmid, contains a logic flaw in which an unauthenticated client can force the RAKP Message 1 handler to return before it overwrites the authentication object's constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte 'userKey' initialized from the string '0penBmc' and an often-predictable 'bmcRandomNum'. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 14:59 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.runzero.com/advisories/openbmc-ipmi-a… | third-party-advisory |
| https://www.runzero.com/blog/lights-out-exposed/ | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenBMC | phosphor-net-ipmid |
Affected:
0 , ≤ ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361
(git)
|
Date Public
2026-09-15 14:00
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CVE-2026-16140 (GCVE-0-2026-16140)
Vulnerability from cvelistv5 – Published: 2026-09-15 13:57 – Updated: 2026-09-15 15:00
VLAI
EPSS
VEX
Title
OpenBMC IPMI Privilege Escalation via Retargeted RAKP 1
Summary
OpenBMC's IPMI implementation, phosphor-net-ipmid, is vulnerable to a logic flaw where the authorization context of an existing session can be replaced with a target account while still maintaining the original integrity and encryption keys. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C. This issue effectively allows for privilege escalation without re-authentication.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 15:00 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.runzero.com/advisories/openbmc-ipmi-p… | third-party-advisory |
| https://www.runzero.com/blog/lights-out-exposed/ | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenBMC | phosphor-net-ipmid |
Affected:
0 , ≤ ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361
(git)
|
Date Public
2026-09-15 14:00
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"references": [
{
"tags": [
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"url": "https://www.runzero.com/advisories/openbmc-ipmi-privsec-rakp-cve-2026-16140/"
},
{
"tags": [
"related"
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"url": "https://www.runzero.com/blog/lights-out-exposed/"
}
],
"source": {
"discovery": "EXTERNAL"
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"title": "OpenBMC IPMI Privilege Escalation via Retargeted RAKP 1",
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"cveId": "CVE-2026-16140",
"datePublished": "2026-09-15T13:57:19.310Z",
"dateReserved": "2026-07-17T17:17:23.941Z",
"dateUpdated": "2026-09-15T15:00:15.848Z",
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