CVE-2021-40333 json
Weak default credential associated with TCP port 26
published 2021-12-02 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27512
- cvss
- 9.0
- 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 51%
- public exploits
- 0
- none known
Summary
Weak Password Requirements vulnerability in Hitachi Energy FOX61x, XCM20 allows an attacker to gain unauthorized access to the Data Communication Network (DCN) routing configuration. This issue affects: Hitachi Energy FOX61x versions prior to R15A. Hitachi Energy XCM20 versions prior to R15A.
Patch / fix
- hitachienergy fox615_firmware r15a
- hitachienergy xcm20_firmware r15a
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-21-341-02 updated cvss 9.0
Hitachi Energy XMC20 and FOX61x
-
Hitachi Energy FOX61x < R15A Hitachi Energy XMC20 < R15Aaffected: vendor fix, mitigation “XMC20: Upgrade to Version R15A” search.abb.com
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H |
| NVD | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N |
| NVD | 2.0 | 5.5 | AV:N/AC:L/Au:S/C:P/I:P/A:N |
Affected products
- Hitachi Energy FOX61x
- Hitachi Energy XCM20
Classification
- Weakness
-
- CWE-521 Weak Password Requirements
References
Sources
- CVE List CVE-2021-40333
- NVD CVE-2021-40333
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