How severe is CVE-2018-14821?

CVE-2018-14821 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-2018-14821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-14821?

CVE-2018-14821 affects Rockwellautomation Rslinx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-14821?

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-2018-14821 published?

CVE-2018-14821 was published on 2018-09-20 and last updated on 2026-06-17.

CVE-2018-14821

CVE-2018-14821 is a high-severity vulnerability in Rockwellautomation Rslinx 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-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Rockwellautomation Rslinx
Published: 2018-09-20
Last modified: 2026-06-17

Description

Rockwell Automation RSLinx Classic Versions 4.00.01 and prior. This vulnerability may allow a remote, unauthenticated threat actor to intentionally send a malformed CIP packet to Port 44818, causing the RSLinx Classic application to terminate. The user will need to manually restart the software to regain functionality.

Frequently asked questions

What is CVE-2018-14821?: Rockwell Automation RSLinx Classic Versions 4.00.01 and prior. This vulnerability may allow a remote, unauthenticated threat actor to intentionally send a malformed CIP packet to Port 44818, causing the RSLinx Classic application to terminate. The user will need to manually restart the software to regain functionality.
How severe is CVE-2018-14821?: CVE-2018-14821 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-2018-14821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-14821?: CVE-2018-14821 affects Rockwellautomation Rslinx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-14821?: 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-2018-14821 published?: CVE-2018-14821 was published on 2018-09-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rockwellautomation:rslinx:*:*:*:*:classic:*:*:*

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