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CVE Record

CVE-2018-3841: A denial-of-service vulnerability exists in the Pixar Renderman IT Display Service 21.6 (0x69).

A denial-of-service vulnerability exists in the Pixar Renderman IT Display Service 21.6 (0x69). The vulnerability is present in the parsing of a network packet without proper validation of the packet. The data read-in is not validated, and its use can lead to a null pointer dereference. The IT application is opened by a user and then listens for a connection on port 4001. An attacker can deliver an attack once the application has been opened.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE can crash Pixar RenderMan IT Display Service after the IT application is opened. The business impact is availability disruption, not data theft or system takeover based on the provided sources. Exposure matters most on render workstations or pipeline hosts where the service is reachable over the network.

Executive priority

Treat this as a targeted availability risk for creative or rendering operations. Prioritize exposed production workstations and shared render environments, especially where disruption could delay deadlines. It is not supported as a critical breach-risk issue by the supplied evidence.

Technical view

The flaw is improper validation while parsing a network packet in Pixar RenderMan IT Display Service 21.6, leading to a null pointer dereference and denial of service. The CVSS v3.0 score is 5.3. The bundle also lists Renderman 12.6, so affected-version evidence should be verified against Talos or vendor guidance.

Likely exposure

Likely exposure is limited to environments using Pixar RenderMan IT where users open the IT application and the service becomes reachable, reportedly on port 4001. Internet exposure would increase urgency, but the sources do not state that this is commonly internet-facing.

Exploitation context

The bundle does not cite CISA KEV listing or active exploitation. It describes unauthenticated network delivery after the user opens the application, with low attack complexity and availability impact only. No confidentiality or integrity impact is identified in the provided CVSS vector.

Researcher notes

The record centers on packet parsing that can dereference a null pointer in IT Display Service. The affected-version data in the bundle is inconsistent between 21.6 and Renderman 12.6, so cite that uncertainty during triage. Do not assume active exploitation or a specific patch without vendor confirmation.

Mitigation direction

  • Check Pixar RenderMan and Talos guidance for a fixed or unaffected version.
  • Upgrade or retire affected RenderMan IT installations if vendor guidance confirms exposure.
  • Restrict network access to the IT Display Service port to trusted hosts only.
  • Avoid launching the IT application on systems that do not need it.
  • Segment render workstations from untrusted or user-controlled networks.

Validation and detection

  • Inventory systems running Pixar RenderMan IT Display Service.
  • Confirm the installed version against Talos and vendor advisories.
  • Check whether the IT application opens a network listener on port 4001.
  • Review firewall rules for inbound access to affected workstations.
  • Validate that mitigations preserve required render-pipeline workflows.
Prepared
Confidence
medium
Sources
3

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-2018-3841 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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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
2Source 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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.3Medium
CVSS 3.0 vector shape for CVE-2018-3841Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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
TalosPixar RendermanRenderman 12.6Listed
Weakness

CWE details

No CWE listed

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