How severe is CVE-2020-5802?

CVE-2020-5802 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-2020-5802 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 39% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5802?

CVE-2020-5802 affects Rockwellautomation Factorytalk Linx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5802?

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-2020-5802 published?

CVE-2020-5802 was published on 2020-12-29 and last updated on 2026-06-17.

CVE-2020-5802

CVE-2020-5802 is a high-severity vulnerability in Rockwellautomation Factorytalk Linx with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 39% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 39% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Rockwellautomation Factorytalk Linx
Published: 2020-12-29
Last modified: 2026-06-17

Description

An attacker-controlled memory allocation size can be passed to the C++ new operator in RnaDaSvr.dll by sending a specially crafted ConfigureItems message to TCP port 4241. This will cause an unhandled exception, resulting in termination of RSLinxNG.exe. Observed in FactoryTalk 6.11. All versions of FactoryTalk Linx are affected.

Frequently asked questions

What is CVE-2020-5802?: An attacker-controlled memory allocation size can be passed to the C++ new operator in RnaDaSvr.dll by sending a specially crafted ConfigureItems message to TCP port 4241. This will cause an unhandled exception, resulting in termination of RSLinxNG.exe. Observed in FactoryTalk 6.11. All versions of FactoryTalk Linx are affected.
How severe is CVE-2020-5802?: CVE-2020-5802 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-2020-5802 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 39% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5802?: CVE-2020-5802 affects Rockwellautomation Factorytalk Linx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5802?: 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-2020-5802 published?: CVE-2020-5802 was published on 2020-12-29 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2020-71

Affected products (1)

cpe:2.3:a:rockwellautomation:factorytalk_linx:*:*:*:*:*:*:*:*

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