CVE-2020-35685
CVSS V2 Medium 6.4
CVSS V3 Critical 9.1
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.)
Overview
- CVE ID
- CVE-2020-35685
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-08-19T12:15:08
- Last Modified Date
- 2021-08-26T18:21:15
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| AND | ||||
| cpe:2.3:a:hcc-embedded:nichestack:3.0:*:*:*:*:*:*:* | 1 | OR | ||
| AND | ||||
| cpe:2.3:o:siemens:sentron_3wa_com190_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.0.0 | |
| cpe:2.3:h:siemens:sentron_3wa_com190:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:siemens:sentron_3wl_com35_firmware:*:*:*:*:*:*:*:* | 1 | OR | 1.2.0 | |
| cpe:2.3:h:siemens:sentron_3wl_com35:-:*:*:*:*:*:*:* | 0 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:P/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 6.4
- Severity
- MEDIUM
- Exploitability Score
- 10
- Impact Score
- 4.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 9.1
- Base Severity
- CRITICAL
- Exploitability Score
- 3.9
- Impact Score
- 5.2
References
| Reference URL | Reference Tags |
|---|---|
| https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf | Mitigation Third Party Advisory |
| https://www.hcc-embedded.com | Product |
| https://www.kb.cert.org/vuls/id/608209 | Third Party Advisory US Government Resource |
| https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/ | Mitigation Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-35685 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35685 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:55:54 | Added to TrackCVE | |||
| 2022-12-05 08:34:00 | 2021-08-19T12:15Z | 2021-08-19T12:15:08 | CVE Published Date | updated |
| 2022-12-05 08:34:00 | 2021-08-26T18:21:15 | CVE Modified Date | updated | |
| 2022-12-05 08:34:00 | Analyzed | Vulnerability Status | updated |