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CVE Record

CVE-2021-29666: IBM Spectrum Scale 5.0.0 through 5.0.5.6 and 5.1.0 through 5.1.0.2 is vulnerable to cross-site scripting.

IBM Spectrum Scale 5.0.0 through 5.0.5.6 and 5.1.0 through 5.1.0.2 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 199400.

MediumCVSS 5.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM Spectrum Scale Web UI versions in the listed 5.0 and 5.1 ranges can allow a logged-in user to place JavaScript into the interface. If another trusted session interacts with it, the script could change page behavior and potentially expose credentials. The issue is medium severity, but matters where the Web UI is reachable by administrators.

Executive priority

Prioritize remediation where affected Spectrum Scale Web UI instances are internet-facing, broadly reachable, or used by administrators. This is not presented as actively exploited in the bundle, but credential exposure in a storage management interface can create meaningful operational risk.

Technical view

CVE-2021-29666 is a cross-site scripting vulnerability in IBM Spectrum Scale 5.0.0 through 5.0.5.6 and 5.1.0 through 5.1.0.2. The CVSS 3.0 score is 5.4 with network attack vector, low privileges required, user interaction required, changed scope, and low confidentiality and integrity impact.

Likely exposure

Exposure is limited to environments running affected IBM Spectrum Scale versions with the Web UI enabled or reachable. Risk is higher if low-privileged users can access the Web UI or if administrators commonly use it from shared trusted sessions.

Exploitation context

The provided bundle does not show CISA KEV listing or other evidence of active exploitation. The CVSS vector indicates exploitation requires low privileges and user interaction, with potential credential disclosure within a trusted Web UI session.

Researcher notes

The source bundle identifies XSS in the Web UI but does not include sink, parameter, or endpoint details. Avoid assuming stored versus reflected behavior beyond the stated ability for users to embed arbitrary JavaScript. Validate only with authorized, non-destructive checks and vendor-safe guidance.

Mitigation direction

  • Check IBM advisory 6447107 for the official fixed maintenance level.
  • Upgrade IBM Spectrum Scale outside the affected version ranges when vendor guidance confirms the target version.
  • Restrict Web UI access to trusted administrative networks and authorized users.
  • Review Web UI roles and remove unnecessary low-privileged access.
  • Monitor vendor guidance and IBM X-Force entry 199400 for remediation details.

Validation and detection

  • Inventory IBM Spectrum Scale versions across all clusters.
  • Identify systems running 5.0.0 through 5.0.5.6 or 5.1.0 through 5.1.0.2.
  • Confirm whether the Web UI is enabled and network-reachable.
  • Review Web UI user accounts for unnecessary access.
  • Check patch status against IBM advisory 6447107.
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.

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CVE-2021-29666 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.4 (3.0)
Known Exploited
No
Published

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

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
5.4CVSS 3.0MediumCVSS:3.0/AC:L/S:C/I:L/AV:N/PR:L/A:N/UI:R/C:L/RL:O/RC:C/E:H2.32.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.4Medium
CVSS 3.0 vector shape for CVE-2021-29666Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
IBMSpectrum Scale5.0, 5.1, 5.1.0.2, 5.0.5.6Listed
Weakness

CWE details

No CWE listed

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