How severe is CVE-2020-5807?

CVE-2020-5807 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-2020-5807 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5807?

CVE-2020-5807 affects Rockwellautomation Factorytalk Diagnostics. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5807?

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-2020-5807 published?

CVE-2020-5807 was published on 2020-12-29 and last updated on 2026-06-17.

CVE-2020-5807

CVE-2020-5807 is a high-severity vulnerability in Rockwellautomation Factorytalk Diagnostics with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 34% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-755.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 34% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-755
Affected product: Rockwellautomation Factorytalk Diagnostics
Published: 2020-12-29
Last modified: 2026-06-17

Description

An unauthenticated remote attacker can send data to RsvcHost.exe listening on TCP port 5241 to add entries in the FactoryTalk Diagnostics event log. The attacker can specify long fields in the log entry, which can cause an unhandled exception in wcscpy_s() if a local user opens FactoryTalk Diagnostics Viewer (FTDiagViewer.exe) to view the log entry. Observed in FactoryTalk Diagnostics 6.11. All versions of FactoryTalk Diagnostics are affected.

Frequently asked questions

What is CVE-2020-5807?: An unauthenticated remote attacker can send data to RsvcHost.exe listening on TCP port 5241 to add entries in the FactoryTalk Diagnostics event log. The attacker can specify long fields in the log entry, which can cause an unhandled exception in wcscpy_s() if a local user opens FactoryTalk Diagnostics Viewer (FTDiagViewer.exe) to view the log entry. Observed in FactoryTalk Diagnostics 6.11. All versions of FactoryTalk Diagnostics are affected.
How severe is CVE-2020-5807?: CVE-2020-5807 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-2020-5807 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5807?: CVE-2020-5807 affects Rockwellautomation Factorytalk Diagnostics. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5807?: 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-2020-5807 published?: CVE-2020-5807 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_diagnostics:*:*:*:*:*:*:*:*

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