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Fencer Intel
high 8.1

CVE-2021-35535 json

Insufficient Security Control Vulnerability

published 4y ago modified 4mo ago also EUVD-2021-22171

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Insecure Boot Image vulnerability in Hitachi Energy Relion Relion 670/650/SAM600-IO series allows an attacker who manages to get access to the front network port and to cause a reboot sequences of the device may exploit the vulnerability, where there is a tiny time gap during the booting process where an older version of VxWorks is loaded prior to application firmware booting, could exploit the vulnerability in the older version of VxWorks and cause a denial-of-service on the product. This issue affects: Hitachi Energy Relion 670 Series 2.2.2 all revisions; 2.2.3 versions prior to 2.2.3.3. Hitachi Energy Relion 670/650 Series 2.2.0 all revisions; 2.2.4 all revisions. Hitachi Energy Relion 670/650/SAM600-IO 2.2.1 all revisions.

Patch / fix

  • Hitachi Energy Relion 670 Series 2.2.3.3

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-336-05 updated cvss 8.1

Hitachi Energy Relion 670/650/SAM600-IO

  • Hitachi Energy Relion 650 >= 2.2.4.0, <= 2.2.4.2, >= 2.2.1.0, <= 2.2.1.6, >= 2.2.0, < 2.2.1 Hitachi Energy Relion 670 >= 2.2.4.0, <= 2.2.4.2, >= 2.2.3.0, <= 2.2.3.3, >= 2.2.2.0, <= 2.2.2.4, >= 2.2.1.0, <= 2.2.1.6
    affected: fixed in 2.2.4.3, mitigation
  • Hitachi Energy SAM-IO >= 2.2.1.0, <= 2.2.1.6
    affected: fixed in 2.2.1.7

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Hitachi Energy Relion 670 Series
  • Hitachi Energy Relion 670/650 Series
  • Hitachi Energy Relion 670/650/SAM600-IO

Classification

Weakness
  • CWE-1188 Initialization of a Resource with an Insecure Default

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.