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CVE Record

CVE-2021-29847: BMC firmware (IBM Power System S821LC Server (8001-12C) OP825.50) configuration changed to allow an authent...

BMC firmware (IBM Power System S821LC Server (8001-12C) OP825.50) configuration changed to allow an authenticated user to open an insecure communication channel which could allow an attacker to obtain sensitive information using man in the middle techniques. IBM X-Force ID: 205267.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue affects IBM Power System S821LC servers running BMC firmware OP825.50. A configuration change may let an authenticated user open an insecure communication channel, creating a path for sensitive information exposure through man-in-the-middle techniques. The available sources rate it medium severity, not a broad remote takeover issue.

Executive priority

Treat this as a targeted infrastructure hygiene issue. It is not flagged as actively exploited, but affected BMC firmware could expose sensitive information on critical server management paths. Prioritize inventory and vendor-guided remediation for any matching IBM Power systems.

Technical view

CVE-2021-29847 is an IBM BMC firmware information disclosure vulnerability in Power System S821LC Server (8001-12C) OP825.50. The source describes an authenticated user enabling an insecure channel, with high confidentiality impact but high attack complexity and user interaction in the CVSS vector. Integrity and availability impacts are not indicated.

Likely exposure

Exposure appears limited to organizations operating the specific IBM Power System S821LC Server (8001-12C) with BMC firmware OP825.50. Risk is higher where BMC management paths can be intercepted or accessed by untrusted users.

Exploitation context

The source bundle does not report active exploitation, and the CVE is not listed as KEV. IBM X-Force labels this as information disclosure. The scenario depends on an insecure communication channel and man-in-the-middle positioning; evidence for public weaponization is not provided.

Researcher notes

The public bundle identifies one affected product and firmware level but does not provide detailed exploit mechanics or a named fixed version. Avoid assuming broader IBM Power exposure. Use IBM advisory and X-Force entry as authoritative sources for remediation details and scope confirmation.

Mitigation direction

  • Inventory IBM Power System S821LC Server (8001-12C) assets and BMC firmware versions.
  • Check IBM support advisory for the vendor-supported remediation or firmware guidance.
  • Prioritize remediation for systems with exposed or shared management networks.
  • Restrict BMC management access to trusted administrative paths where operationally feasible.
  • Monitor for unexpected BMC configuration changes or unusual management-channel activity.

Validation and detection

  • Confirm whether any IBM Power System S821LC Server assets run BMC firmware OP825.50.
  • Review BMC configuration for insecure communication-channel settings described by IBM guidance.
  • Validate that vendor-recommended remediation has been applied where applicable.
  • Check network placement of BMC interfaces for interception or unauthorized access risk.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-29847 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/PR:N/I:N/S:U/UI:R/C:H/AC:H/A:N/AV:N/E:U/RC:C/RL:O

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.0MediumCVSS:3.0/PR:N/I:N/S:U/UI:R/C:H/AC:H/A:N/AV:N/E:U/RC:C/RL:O1.63.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.3Medium
CVSS 3.0 vector shape for CVE-2021-29847Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/PR:N/I:N/S:U/UI:R/C:H/AC:H/A:N/AV:N/E:U/RC:C/RL:O

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
IBMPower System S821LC Server (8001-12C)OP825.50Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.