CVE-2020-5806
No exploitation reported by the sources we read.
- Published2020-12-29
- WeaknessCWE-770
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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 attacker-controlled memory allocation size can be passed to the C++ new operator in the CServerManager::HandleBrowseLoadIconStreamRequest in messaging.dll. This can be done by sending a specially crafted message to 127.0.0.1:7153. Observed in FactoryTalk Linx 6.11. All versions of FactoryTalk Linx are affected.
Timeline
dates in UTC- 2020-12-2916:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-5806?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-5806?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 6.11 | ≤ 6.11 | no fix published | NVD |
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
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)
Fix
- Mitigation from the vendor CISA ICSA-21-028-01 · 1 productRockwell Automation published PN1540 to inform users of the risk of these vulnerabilities and instruct users on the proper use of patches.
- Mitigation from the vendor CISA ICSA-21-028-01 · 1 productUtilize proper network infrastructure controls, such as firewalls, to help ensure traffic from unauthorized sources is blocked.
- Mitigation from the vendor CISA ICSA-21-028-01 · 1 productConsult the product documentation for specific features, such as a hardware keyswitch setting, which may be used to block unauthorized changes, etc.
- Mitigation from the vendor CISA ICSA-21-028-01 · 1 productBlock 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…
- Mitigation from the vendor CISA ICSA-21-028-01 · 1 productRun all software as a User, not as an Administrator, to minimize the impact of malicious code on the infected system.
- Mitigation from the vendor CISA ICSA-21-028-01 · 1 productUse 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 3.15.5read 2026-10-23
- NVDCVSS 2.02.1read 2026-10-23
- NVDweakness (CWE)CWE-770read 2026-10-23
- FIRST EPSSEPSS score4.8 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:L/PR:L/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-2020-5806?
Is CVE-2020-5806 actively exploited?
What is the CVSS score for CVE-2020-5806?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.