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CVE Record

CVE-2021-29765: IBM PowerVM Hypervisor FW940 and FW950 could allow an attacker to obtain sensitive information if they gain...

IBM PowerVM Hypervisor FW940 and FW950 could allow an attacker to obtain sensitive information if they gain service access to the FSP. IBM X-Force ID: 202476.

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue affects IBM PowerVM Hypervisor firmware FW940 and FW950. If an attacker gains service access to the Flexible Service Processor, they may obtain sensitive information. The business concern is confidentiality exposure on IBM Power environments, not system takeover or disruption based on the provided sources.

Executive priority

Treat this as a moderate-priority confidentiality issue for IBM Power environments. Prioritize systems with sensitive workloads or broader FSP service access, and align remediation with IBM guidance.

Technical view

CVE-2021-29765 is an IBM PowerVM Hypervisor information disclosure vulnerability in FW940 and FW950. The CVSS 3.0 score is 5.9 with high attack complexity, network attack vector, no required privileges, and high confidentiality impact only. No CWE is listed in the provided bundle.

Likely exposure

Exposure is limited to environments running IBM PowerVM Hypervisor FW940 or FW950. Risk depends on whether an attacker can obtain service access to the FSP. Internet exposure is not established by the sources.

Exploitation context

The provided data does not show active exploitation. It is not listed as KEV, and the CVSS exploit code maturity is unproven. Exploitation requires the attacker to gain service access to the FSP, making access control around management paths important.

Researcher notes

The key exposure condition is service access to the FSP. Sources provide limited technical detail and no exploit procedure. Validation should focus on firmware identification, FSP access paths, and whether IBM advisory remediation has been applied.

Mitigation direction

  • Review IBM support advisory 6478039 for official remediation details.
  • Identify PowerVM systems running FW940 or FW950.
  • Apply IBM-approved firmware remediation where applicable.
  • Restrict FSP service access to authorized management paths.
  • Monitor FSP access activity for unexpected service connections.

Validation and detection

  • Inventory IBM Power systems and record PowerVM firmware levels.
  • Confirm whether any systems run FW940 or FW950.
  • Review who can access FSP service interfaces.
  • Check IBM advisory status against deployed firmware.
  • Look for unexpected FSP service access in available logs.
Prepared
Confidence
high
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-2021-29765 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.9 (3.0)
Known Exploited
No
Published

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

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
5.9CVSS 3.0MediumCVSS:3.0/AC:H/PR:N/AV:N/A:N/I:N/C:H/UI:N/S:U/E:U/RL:O/RC:C2.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.9Medium
CVSS 3.0 vector shape for CVE-2021-29765Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
IBMPowerVM HypervisorFW940, FW950Listed
Weakness

CWE details

No CWE listed

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