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VULNERABILITIES

CVE-2020-35685 Details

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.)

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf CVEMitigationThird Party Advisory
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/ CVEMitigationThird Party Advisory
https://www.hcc-embedded.com CVEProduct
https://www.kb.cert.org/vuls/id/608209 CVEThird Party AdvisoryUS Government Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf [email protected]MitigationThird Party Advisory

see all 8 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-330Use of Insufficiently Random Values[email protected]

Affected Products

ProductVersions
hcc-embedded nichestack
3.0

CPE

  • cpe:2.3:a:hcc-embedded:nichestack:3.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
siemens sentron 3wa com190 firmware
< 2.0.0

CPE

  • cpe:2.3:o:siemens:sentron_3wa_com190_firmware:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
siemens sentron 3wa com190
All versions

CPE

  • cpe:2.3:h:siemens:sentron_3wa_com190:-:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
siemens sentron 3wl com35 firmware
< 1.2.0

CPE

  • cpe:2.3:o:siemens:sentron_3wl_com35_firmware:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
siemens sentron 3wl com35
All versions

CPE

  • cpe:2.3:h:siemens:sentron_3wl_com35:-:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-35685
NVD Published Date:
Aug 19, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2020-35685 Details - Not Deferred