No exploitation reportedFix available

CVE-2020-27263

No exploitation reported by the sources we read.

Published2021-01-14
WeaknessCWE-122 · CWE-787

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

KEPServerEX: v6.0 to v6.9, ThingWorx Kepware Server: v6.8 and v6.9, ThingWorx Industrial Connectivity: All versions, OPC-Aggregator: All versions, Rockwell Automation KEPServer Enterprise, GE Digital Industrial Gateway Server: v7.68.804 and v7.66, Software Toolbox TOP Server: All 6.x versions, are vulnerable to a heap-based buffer overflow. Opening a specifically crafted OPC UA message could allow an attacker to crash the server and potentially leak data.

Timeline

dates in UTC

2021-01-1400:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2020-27263?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27263?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ge industrial gateway server

Branch	Affected	Fixed in	Source
7.66	= 7.66	no fix published	NVD
7.68	= 7.68.804	no fix published	NVD

Ptc kepware kepserverex

Branch	Affected	Fixed in	Source
6.0	= 6.0	no fix published	NVD
6.9	= 6.9	no fix published	NVD

Ptc thingworx kepware server

Branch	Affected	Fixed in	Source
6.8	= 6.8	no fix published	NVD
6.9	= 6.9	no fix published	NVD

4 more products in the sources.

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-20-352-02 CISA7 known affected
PTC Kepware KEPServerEX (Update A)
ThingWorx Kepware Server: v6.8 and v6.9 · Rockwell Automation KEPServer Enterprise: v6.6.504.0 and v6.9.572.0 · GE Digital Industrial Gateway Server: v7.68.804 and v7.66 · +4 more

Full record on NVD

Fix

Vendor fix CISA ICSA-20-352-02 · 7 productsOPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0
Mitigation from the vendor CISA ICSA-20-352-02 · 7 productsPTC has released updates for the following products and recommends that users upgrade to the most current supported version:
Mitigation from the vendor CISA ICSA-20-352-02 · 7 productsKEPServerEX Version 6.6 should upgrade to Version 6.6.362.0
Mitigation from the vendor CISA ICSA-20-352-02 · 7 productsKEPServerEX Version 6.7 should upgrade to Version 6.7.1067.0
Mitigation from the vendor CISA ICSA-20-352-02 · 7 productsKEPServerEX Version 6.8 should upgrade to Version 6.8.838.0
Mitigation from the vendor CISA ICSA-20-352-02 · 7 productsKEPServerEX Version 6.9 should upgrade to Version 6.9.584.0

Detection

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

Sources

NVDCVSS 3.19.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
CNAweakness (CWE)CWE-122read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score5.0 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published: 2021-01-14
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-27263?

Is CVE-2020-27263 actively exploited?

Active exploitation of CVE-2020-27263 has not been confirmed. Its EPSS score was 5.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-27263?

CVE-2020-27263 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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