A buffer overflow exists in HelpSystems tcpcrypt on Linux, used for BoKS encrypted telnet…
Priority MEDIUM 44Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.01185 68th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:helpsystems:boks:*:*:*:*:*:*:*:* | 6.6.0 – 6.7.1 | Vulnerable | Helpsystems |
| cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Linux |
- cpe:2.3:a:helpsystems:boks:*:*:*:*:*:*:*:* Versions 6.6.0 – 6.7.1 Vulnerable ·Helpsystems
- cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20764
- 2026-10-03 Alias added: GHSA-45g7-3c3h-rm3p
References
Sources
- CVE-2018-20764 · CVE Program
- CVE-2018-20764 · NVD
- FIRST EPSS
- GHSA-45g7-3c3h-rm3p · GitHub Advisory Database · CC BY 4.0
- CVE-2018-20764 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences