Vulnerability-Lookup

FKIE_CVE-2026-16141

Vulnerability from fkie_nvd - Published: 2026-09-15 14:16 - Updated: 2026-09-15 15:17

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

References

	URL	Tags
	44488dab-36db-4358-99f9-bc116477f914	https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/
	44488dab-36db-4358-99f9-bc116477f914	https://www.runzero.com/blog/lights-out-exposed/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "phosphor-net-ipmid",
          "repo": "https://github.com/openbmc/phosphor-net-ipmid",
          "vendor": "OpenBMC",
          "versions": [
            {
              "lessThanOrEqual": "ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361",
              "status": "affected",
              "version": "0",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenBMC\u0027s 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\u0027s constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte \u0027userKey\u0027 initialized from the string \u00270penBmc\u0027 and an often-predictable \u0027bmcRandomNum\u0027. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C."
    }
  ],
  "id": "CVE-2026-16141",
  "lastModified": "2026-09-15T15:17:13.377",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "44488dab-36db-4358-99f9-bc116477f914",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-16141",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-15T14:59:02.838838Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-15T14:16:50.430",
  "references": [
    {
      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "url": "https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/"
    },
    {
      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "url": "https://www.runzero.com/blog/lights-out-exposed/"
    }
  ],
  "sourceIdentifier": "44488dab-36db-4358-99f9-bc116477f914",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-457"
        },
        {
          "lang": "en",
          "value": "CWE-798"
        }
      ],
      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "type": "Secondary"
    }
  ]
}

CVE-2026-16141 (GCVE-0-2026-16141)

Vulnerability from cvelistv5 – Published: 2026-09-15 13:57 – Updated: 2026-09-15 14:59

Title

OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value

Summary

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 14:59 UTC

CWE

CWE-798 - Use of Hard-coded Credentials
CWE-457 - Use of Uninitialized Variable

Assigner

runZero icscert root

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

Credits

HD Moore of runZero Gadi Evron of Knostic Tod Beardsley of runZero

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-16141",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T14:59:02.838838Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-15T14:59:11.232Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "phosphor-net-ipmid",
          "repo": "https://github.com/openbmc/phosphor-net-ipmid",
          "vendor": "OpenBMC",
          "versions": [
            {
              "lessThanOrEqual": "ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361",
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              "version": "0",
              "versionType": "git"
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          ]
        }
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "HD Moore of runZero"
        },
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          "type": "finder",
          "value": "Gadi Evron of Knostic"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Tod Beardsley of runZero"
        }
      ],
      "datePublic": "2026-09-15T14:00:00.000Z",
      "descriptions": [
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          "supportingMedia": [
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              "type": "text/html",
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            }
          ],
          "value": "OpenBMC\u0027s 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\u0027s constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte \u0027userKey\u0027 initialized from the string \u00270penBmc\u0027 and an often-predictable \u0027bmcRandomNum\u0027. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C."
        }
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            "attackComplexity": "HIGH",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          "scenarios": [
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            {
              "cweId": "CWE-457",
              "description": "CWE-457 Use of Uninitialized Variable",
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        "orgId": "44488dab-36db-4358-99f9-bc116477f914",
        "shortName": "runZero"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/"
        },
        {
          "tags": [
            "related"
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          "url": "https://www.runzero.com/blog/lights-out-exposed/"
        }
      ],
      "source": {
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    "datePublished": "2026-09-15T13:57:28.846Z",
    "dateReserved": "2026-07-17T17:17:25.183Z",
    "dateUpdated": "2026-09-15T14:59:11.232Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.