CVE-2020-35685
At a glance
- Source
- NVD
- EPSS
- EPSS 2.05 % · percentile 81 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- mitre
- NVD status
- Modified
Description
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.)
Weaknesses (CWE)
- CWE-330 — Use of Insufficiently Random Values
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2020-23344
- GCVE · GCVE-0-2020-35685
CERT-FR advisories
- CERTFR-2023-AVI-0363 — Multiples vulnérabilités dans les produits Schneider · cert.ssi.gouv.fr
- CERTFR-2022-AVI-815 — Multiples vulnérabilités dans les produits Schneider · cert.ssi.gouv.fr
- CERTFR-2021-AVI-599 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:hcc-embedded:nichestack:3.0:*:*:*:*:*:*:*cpe:2.3:o:siemens:sentron_3wa_com190_firmware:*:*:*:*:*:*:*:*< 2.0.0cpe:2.3:o:siemens:sentron_3wl_com35_firmware:*:*:*:*:*:*:*:*< 1.2.0
Affected products
| Product | Versions |
|---|---|
| affected n/a |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |