How severe is CVE-2018-3840?

CVE-2018-3840 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-3840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-3840?

CVE-2018-3840 affects Pixar Renderman. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-3840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-3840 published?

CVE-2018-3840 was published on 2018-06-26 and last updated on 2026-06-17.

CVE-2018-3840

CVE-2018-3840 is a high-severity vulnerability in Pixar Renderman with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Pixar Renderman
Published: 2018-06-26
Last modified: 2026-06-17

Description

A denial-of-service vulnerability exists in the Pixar Renderman IT Display Service 21.6 (0x67). The vulnerability is present in the parsing of a network packet without proper validation of the packet. The data read by the application 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.

Frequently asked questions

What is CVE-2018-3840?: A denial-of-service vulnerability exists in the Pixar Renderman IT Display Service 21.6 (0x67). The vulnerability is present in the parsing of a network packet without proper validation of the packet. The data read by the application 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.
How severe is CVE-2018-3840?: CVE-2018-3840 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-3840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-3840?: CVE-2018-3840 affects Pixar Renderman. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-3840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-3840 published?: CVE-2018-3840 was published on 2018-06-26 and last updated on 2026-06-17.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0523

Affected products (1)

cpe:2.3:a:pixar:renderman:21.6:*:*:*:*:*:*:*

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