What’s Vulnerable › Vulnerabilities

CVE-2020-27297

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-26 · updated 2026-06-17
• Weakness: CWE-122

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).

Affected products

• OPC UA Tunneller: before 6.3.0.8233 — fixed in 6.3.0.8233

How to fix

Upgrade to a fixed version: OPC UA Tunneller 6.3.0.8233. Check the vendor advisory for mitigations.

References

• https://us-cert.cisa.gov/ics/advisories/icsa-21-021-03
• https://us-cert.cisa.gov/ics/advisories/icsa-21-021-03

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