What is CVE-2020-27274?

CVE-2020-27274 is a high-severity vulnerability in Honeywell Opc Ua Tunneller, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2021-01-26.

How severe is CVE-2020-27274?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Honeywell Opc Ua Tunneller

CVE-2020-27274

Some parsing functions in the affected product do not check the return value of malloc and the thread handling the message is forced to close, which may lead to a denial-of-service condition on the OPC UA Tunneller (versions prior to 6.3.0.8233).

Published 2021-01-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Honeywell Opc Ua Tunneller
Opc Ua Tunneller — versions All versions prior to 6.3.0.8233

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

us-cert.cisa.gov/ics/advisories/icsa-21-021-03 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27274?: CVE-2020-27274 is a high-severity vulnerability in Honeywell Opc Ua Tunneller, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2021-01-26.
How severe is CVE-2020-27274?: High severity. CVSS v3 base score is 7.5 out of 10.