CVE-2020-27299

Name: CVE-2020-27299
Creator: NVD / NIST
Published: 2021-01-26T19:15:13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.67%

Last modified Jun 17, 2026

CVE-2020-27299 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. The affected product is vulnerable to an out-of-bounds read, which may allow an attacker to obtain and disclose sensitive data information or cause the device to crash on the OPC UA Tunneller (versions prior to 6.3.0.8233).. EPSS estimates a 1.67% chance of exploitation in the next 30 days.

Description

The affected product is vulnerable to an out-of-bounds read, which may allow an attacker to obtain and disclose sensitive data information or cause the device to crash on the OPC UA Tunneller (versions prior to 6.3.0.8233).

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

1.67%

73.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Honeywell	Opc Ua Tunneller	< 6.3.0.8233

References

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

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27299?

How severe is CVE-2020-27299?

CVE-2020-27299 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.67% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27299?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27299?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST