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No exploitation reportedFix available

CVE-2020-27297

No exploitation reported by the sources we read.

  • Published2021-01-26
  • Fixed in6.3.0.8233
  • 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

The affected product is vulnerable to a heap-based buffer overflow, which may allow an attacker to manipulate memory with controlled values and remotely execute code on the OPC UA Tunneller (versions prior to 6.3.0.8233).

Timeline

dates in UTC
  1. 2021-01-2619:15CVE 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-2020-27297?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27297?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Honeywell opc ua tunneller
BranchAffectedFixed in
6.3< 6.3.0.82336.3.0.8233

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-21-021-03 CISA1 known affected

    Honeywell OPC UA Tunneller

    OPC UA Tunneller: All versions prior to 6.3.0.8233

Full record on NVD

Fix

  1. Update Honeywell opc ua tunneller to 6.3.0.8233
  2. Vendor fix CISA ICSA-21-021-03 · 1 productHoneywell recommends upgrading Matrikon OPC UA Tunneller to Version 6.3.0.8233

Detection

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

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-122read 2026-10-23
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score2.5 %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
2021-01-26
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-27297?

The affected product is vulnerable to a heap-based buffer overflow, which may allow an attacker to manipulate memory with controlled values and remotely execute code on the OPC UA Tunneller (versions prior to 6.3.0.8233).

Is CVE-2020-27297 actively exploited?

Active exploitation of CVE-2020-27297 has not been confirmed. Its EPSS score was 2.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-27297?

CVE-2020-27297 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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