An issue was discovered in HCC Nichestack 3.0.
Priority MEDIUM 43CWE-330Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An issue was discovered in HCC Nichestack 3.0. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. (Proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.)
Why it matters now
EPSS 0.02051 81st 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 · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:hcc-embedded:nichestack:3.0:*:*:*:*:*:*:* | 3.0 | Vulnerable | Hcc-embedded |
| cpe:2.3:o:siemens:sentron_3wa_com190_firmware:*:*:*:*:*:*:*:* | before 2.0.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_3wa_com190:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_3wl_com35_firmware:*:*:*:*:*:*:*:* | before 1.2.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_3wl_com35:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:a:hcc-embedded:nichestack:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Hcc-embedded
- cpe:2.3:o:siemens:sentron_3wa_com190_firmware:*:*:*:*:*:*:*:* Versions before 2.0.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_3wa_com190:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_3wl_com35_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_3wl_com35:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-35685
- 2026-10-03 Alias added: GHSA-hf8h-gvq7-6gfr
References
Sources
- CVE-2020-35685 · CVE Program
- CVE-2020-35685 · NVD
- FIRST EPSS
- GHSA-hf8h-gvq7-6gfr · GitHub Advisory Database · CC BY 4.0
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