What’s Vulnerable › Vulnerabilities

CVE-2018-20764

• Severity: critical (CVSS 9.8 v3.0)
• 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: 2019-02-08 · updated 2026-06-17

Description

A buffer overflow exists in HelpSystems tcpcrypt on Linux, used for BoKS encrypted telnet through BoKS version 6.7.1. Since tcpcrypt is setuid, exploitation leads to privilege escalation.

Affected products

• Helpsystems Boks: from 6.6.0 through 6.7.1

References

• https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/
• https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/

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