CVE-2021-40342

criticalpriority · track · 39OT risk · elevatedEPSS 0.003 · 22 %ileEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.29% (22nd) EPSS
CVSS 9.8 · critical
Is it mine?
56 products
Check your exposure
Who says so?
3 sources
cnnvd · enisa_euvd · cisa_csaf_ot

EPSS · scored 2026-10-27

In the DES implementation, the affected product versions use a default key for encryption. Successful exploitation allows an attacker to obtain sensitive information and gain access to the network elements that are managed by the affected products versions. This issue affects * FOXMAN-UN product: FOXMAN-UN R16A, FOXMAN-UN R15B, FOXMAN-UN R15A, FOXMAN-UN R14B, FOXMAN-UN R14A, FOXMAN-UN R11B, FOXMAN-UN R11A, FOXMAN-UN R10C, FOXMAN-UN R9C; * UNEM product: UNEM R16A, UNEM R15B, UNEM R15A, UNEM R14B, UNEM R14A, UNEM R11B, UNEM R11A, UNEM R10C, UNEM R9C. List of CPEs: * cpe:2.3:a:hitachienergy:foxman-un:R16A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R15B:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R15A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R14B:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R14A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R11B:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R11A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R10C:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:foxman-un:R9C:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R16A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R15B:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R15A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R14B:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R14A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R11B:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R11A:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R10C:*:*:*:*:*:*:* * cpe:2.3:a:hitachienergy:unem:R9C:*:*:*:*:*:*:*

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedUNEMcisa_csaf_ot

    For CVE-2021-40341, CVE-2021-40342, UNEM R16A has partial remediation. The full remediation will be complete in an upcoming UNEM release.

  • FixedFOXMAN-UNcisa_csaf_ot

    For CVE-2021-40341, CVE-2021-40342, FOXMAN-UN R16A has partial remediation. The full remediation will be complete in an upcoming FOXMAN-UN release.

  • MitigationUNEMcisa_csaf_ot

    Avoid embedded FOXCST with RADIUS authentication.

  • MitigationFOXMAN-UNcisa_csaf_ot

    Avoid embedded FOXCST with RADIUS authentication.

02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.1–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.07.1highCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:Nsecondary · CISA US
v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:Nsecondary · ENISA EU
v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:Nsecondary · cybersecurity@hitachienergy.comexploitability 2.5 · impact 4
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-1394USCWE-326USCWE-798US
05

affected products (56)

Products and version ranges known to be affected.

showing 20 of 56
06

advisories (2)

Vendor and ecosystem advisories describing this.

  • ICSA-23-005-01Hitachi Energy UNEM2023-01-05icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could allow an unauthorized user to obtain sensitive information and gain access to the network elements managed by the UNEM and could cause availability issue on affected UNEM products.

  • ICSA-23-005-02Hitachi Energy FOXMAN-UN2023-01-05icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could allow an unauthorized user to obtain sensitive information and gain access to the network elements managed by the FOXMAN-UN, and could cause an availability issue on affected FOXMAN-UN products.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otNVDCVE.orgMITRE
published 2023-01-05modified 2026-06-17
10

references (8)

External citations — patches, advisories, analysis.

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