by Kastro
Paper/Archive/CVE-2020-35685

CVE-2020-35685

mitre — An issue was discovered in HCC Nichestack 3.0.

EPSS 2%CVSS 9.1
critical.is priorityof 100
44
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 81.3.813 × 2016.3No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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.)

Affected

ProductAffectedFixed inSource
n/an/a–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

refhcc-embedded.comrefcert-portal.siemens.com/productcert/pdf/ssa-789208.pdfrefforescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestackwriteupkb.cert.org/vuls/id/608209