What’s Vulnerable › Vulnerabilities

CVE-2020-27274

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% 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-754

Description

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).

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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