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CVE Record

CVE-2021-47621: ClassGraph before 4.8.112 was not resistant to XML eXternal Entity (XXE) attacks.

ClassGraph before 4.8.112 was not resistant to XML eXternal Entity (XXE) attacks.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

ClassGraph versions before 4.8.112 could be vulnerable to XML External Entity handling. In business terms, an exposed application using the library may leak sensitive information if vulnerable XML parsing is reachable. The CVE is high severity, but the supplied sources do not show active exploitation.

Executive priority

Treat as a high-priority dependency remediation item, especially for externally reachable services. The main business concern is confidentiality loss, not service disruption. Absence from KEV lowers emergency pressure but does not remove upgrade urgency.

Technical view

CVE-2021-47621 is a CWE-611 XXE weakness in ClassGraph before 4.8.112. CVSS 3.1 is 7.5: network reachable, low complexity, no privileges, no user interaction, with high confidentiality impact and no stated integrity or availability impact.

Likely exposure

Exposure is most likely in Java applications or platforms that include ClassGraph before 4.8.112, directly or transitively. The CVE metadata does not provide CPEs or a complete product list, so dependency inventory is required.

Exploitation context

The bundle does not cite KEV listing or any public source confirming active exploitation. The risk is data exposure through XXE if vulnerable XML parsing is reachable from attacker-controlled input.

Researcher notes

The evidence identifies the weakness, fixed release, commit, and pull request, but lacks detailed reachability notes, affected CPEs, and exploit telemetry. Avoid assuming every ClassGraph use is exploitable; verify vulnerable version presence and reachable XML parsing paths.

Mitigation direction

  • Upgrade ClassGraph to 4.8.112 or later where used directly.
  • Check vendor guidance for products bundling ClassGraph transitively.
  • Review dependency lockfiles and build manifests for older ClassGraph versions.
  • Prioritize internet-facing services where XML parsing may process untrusted input.
  • Track downstream platform advisories before assuming bundled fixes.

Validation and detection

  • Inventory direct and transitive ClassGraph dependencies across Java applications.
  • Confirm no deployed artifact contains ClassGraph before 4.8.112.
  • Review vendor release notes for bundled dependency updates.
  • Validate XML parser hardening in affected application paths.
  • Record systems where reachability cannot be confirmed.
Prepared
Confidence
medium
Sources
6

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-611: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-47621 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

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
5Source 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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2021-47621Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
n/an/an/aListed
Weakness

CWE details

CWE-611

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

CWE-611 · source CWE mapping

Improper Restriction of XML External Entity Reference

Improper Restriction of XML External Entity Reference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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