Vulnerability-Lookup

GHSA-28W7-PG33-G2HJ

Vulnerability from github – Published: 2026-09-15 15:32 – Updated: 2026-09-15 15:32

Details

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)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-16141"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-457"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-15T14:16:50Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-28w7-pg33-g2hj",
  "modified": "2026-09-15T15:32:11Z",
  "published": "2026-09-15T15:32:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16141"
    },
    {
      "type": "WEB",
      "url": "https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141"
    },
    {
      "type": "WEB",
      "url": "https://www.runzero.com/blog/lights-out-exposed"
    }
  ],
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  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

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JSON

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                  },
                  {
                    "Technical Impact": "total"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T14:59:02.838838Z",
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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.