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No exploitation reported

CVE-2020-5807

No exploitation reported by the sources we read.

  • Published2020-12-29
  • WeaknessCWE-755

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2020-12-2916:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-5807?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-5807?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Rockwellautomation factorytalk diagnostics
BranchAffectedFixed in
6.11≤ 6.11no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-21-028-01 CISA2 known affected

    Rockwell Automation FactoryTalk Linx and FactoryTalk Services Platform

    FactoryTalk Linx software: Versions 6.20 and prior (CVE-2020-5806 only affects Versions 6.10 6.11 and 6.20) · FactoryTalkServices Platform: Versions 6.20 and prior (Only affected by CVE-2020-5807)

Full record on NVD

Fix

  1. Mitigation from the vendor CISA ICSA-21-028-01 · 2 productsRockwell Automation published PN1540 to inform users of the risk of these vulnerabilities and instruct users on the proper use of patches.
  2. Mitigation from the vendor CISA ICSA-21-028-01 · 2 productsUtilize proper network infrastructure controls, such as firewalls, to help ensure traffic from unauthorized sources is blocked.
  3. Mitigation from the vendor CISA ICSA-21-028-01 · 2 productsConsult the product documentation for specific features, such as a hardware keyswitch setting, which may be used to block unauthorized changes, etc.
  4. Mitigation from the vendor CISA ICSA-21-028-01 · 2 productsBlock all traffic to EtherNet/IP or other CIP protocol-based devices from outside the manufacturing zone by blocking or restricting access to TCP and UDP Port 2222 and Port 44818 using proper network infrastructure controls, such as firewalls, UTM devices, or other security appliances. For more inf…
  5. Mitigation from the vendor CISA ICSA-21-028-01 · 2 productsRun all software as a User, not as an Administrator, to minimize the impact of malicious code on the infected system.
  6. Mitigation from the vendor CISA ICSA-21-028-01 · 2 productsUse Microsoft AppLocker or other similar allow list applications to help mitigate risk. Information on using AppLocker with Rockwell Automation products is available at Knowledgebase Article ID QA17329.

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-755read 2026-10-23
  • FIRST EPSSEPSS score39.3 %read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-12-29
Last Modified
2026-06-17
NVD status
Modified

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.

Is CVE-2020-5807 actively exploited?

Active exploitation of CVE-2020-5807 has not been confirmed. Its EPSS score was 39.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-5807?

CVE-2020-5807 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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