How severe is CVE-2023-1257?

CVE-2023-1257 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-1257 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-1257?

CVE-2023-1257 primarily affects Moxa Uc-2101-lx Firmware. In total, 55 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-1257?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-1257 published?

CVE-2023-1257 was published on 2023-03-07 and last updated on 2026-06-17.

CVE-2023-1257

CVE-2023-1257 is a high-severity vulnerability in Moxa Uc-2101-lx Firmware with a CVSS 3.x base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.6)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Moxa Uc-2101-lx Firmware
Published: 2023-03-07
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-1257?: 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.
How severe is CVE-2023-1257?: CVE-2023-1257 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-1257 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-1257?: CVE-2023-1257 primarily affects Moxa Uc-2101-lx Firmware. In total, 55 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-1257?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-1257 published?: CVE-2023-1257 was published on 2023-03-07 and last updated on 2026-06-17.

References

https://www.cisa.gov/uscert/ics/advisories/icsa-22-333-04

Affected products (55)

cpe:2.3:o:moxa:uc-2101-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2102-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2102-t-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2104-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2111-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2112-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2114-t-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2114-t-lx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-2116-t-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3101-t-ap-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3101-t-eu-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3101-t-us-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3111-t-ap-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3111-t-ap-lx-nw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3111-t-eu-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3111-t-eu-lx-nw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3111-t-us-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3111-t-us-lx-nw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3121-t-ap-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3121-t-eu-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-3121-t-us-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5101-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5101-t-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5102-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5102-t-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5111-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5111-t-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5112-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-5112-t-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8112-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8131-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8132-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8162-lx_firmware:1.2:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8112-me-t-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8112-me-t-lx1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8112a-me-t-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8210-t-lx-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8220-t-lx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8220-t-lx-ap-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:uc-8220-t-lx-eu-s_firmware:*:*:*:*:*:*:*:*

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