No exploitation reportedFix available

CVE-2020-27251

No exploitation reported by the sources we read.

Published2020-11-26
WeaknessCWE-122

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

A heap overflow vulnerability exists within FactoryTalk Linx Version 6.11 and prior. This vulnerability could allow a remote, unauthenticated attacker to send malicious port ranges, which could result in remote code execution.

Timeline

dates in UTC

2020-11-2602:15CVE publishedNVD

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-2020-27251?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27251?format=csv
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Versions per branch

NVD

Rockwellautomation factorytalk linx

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

ICSA-20-329-01 CISA1 known affected
Rockwell Automation FactoryTalk Linx
FactoryTalk Linx: Version 6.11 and prior

Full record on NVD

Fix

Vendor fix CISA ICSA-20-329-01 · 1 productRockwell Automation recommends users of the affected FactoryTalk Linx update to an available software revision that addresses the associated risk.
Vendor fix CISA ICSA-20-329-01 · 1 productFactoryTalk Linx v6.10/6.11 (see Patch Answer ID 1126433). Additionally, the user could move to v6.20, which is available on PCDC (login required).
Mitigation from the vendor CISA ICSA-20-329-01 · 1 productRun all software as “user” (not as “administrator”) to minimize the impact of malicious code on the infected system.
Mitigation from the vendor CISA ICSA-20-329-01 · 1 productUse of Microsoft AppLocker or other similar whitelisting application can help mitigate risk. Information on using AppLocker with Rockwell Automation products is available at Knowledgebase Article ID 546989 (login required).
Mitigation from the vendor CISA ICSA-20-329-01 · 1 productConfirm that the least-privilege user principle is followed, and user/service account access to shared resources (such as a database) is only granted with a minimum amount of rights as needed.
Mitigation from the vendor CISA ICSA-20-329-01 · 1 productUse trusted software, software patches, antivirus/antimalware programs, and interact only with trusted websites and attachments.

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-122read 2026-10-23
FIRST EPSSEPSS score6.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2020-11-26
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-27251?

Is CVE-2020-27251 actively exploited?

Active exploitation of CVE-2020-27251 has not been confirmed. Its EPSS score was 6.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-27251?

CVE-2020-27251 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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