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Fencer Vulns
high 7.6

CVE-2023-1257 json

CVE-2023-1257

published 2023-03-07 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-23526

cvss
7.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

An attacker with physical access to the affected Moxa UC Series devices can initiate a restart of the device and gain access to its BIOS. Command line options can then be altered, allowing the attacker to access the terminal. From the terminal, the attacker can modify the device’s authentication files to create a new user and gain full access to the system.

Vendor advisories

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

cisa ICSA-22-333-04 updated cvss 7.6

Moxa UC Series

  • Moxa UC-2100 Series >= 1.3, <= 1.5 Moxa UC-2100-W Series >= 1.3, <= 1.5 Moxa UC-3100 Series >= 1.2, <= 2.0 Moxa UC-5100 Series 1.2 Moxa UC-8100 Series >= 1.2, <= 1.3 Moxa UC-8100A-ME-T Series >= 1.0, <= 1.1
    +4 more products
    Moxa UC-8200 Series >= 1.0, >= 2.4 Moxa UC-8410A Series 2.2 Moxa UC-8540 Series >= 1.0, <= 1.2 Moxa UC-8580 Series 1.1
    affected: mitigation “Moxa has developed updates for all of the affected products to address this vulnerability. Moxa encourages users to contact Moxa Technical Support (login required) to obtain the update.” moxa.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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.6 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 6.8 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • MOXA UC-8580 Series
  • MOXA UC-8540 Series
  • MOXA UC-8410A Series
  • MOXA UC-8200 Series
  • MOXA UC-8100A-ME-T Series
  • MOXA UC-8100 Series
  • MOXA UC-5100 Series
  • MOXA UC-3100 Series
  • MOXA UC-2100 Series
  • MOXA UC-2100-W Series

References

Sources

Fencer Vulns 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.