How severe is CVE-2023-26066?

CVE-2023-26066 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-26066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26066?

CVE-2023-26066 primarily affects Lexmark Cxtpc Firmware. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-26066?

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

When was CVE-2023-26066 published?

CVE-2023-26066 was published on 2023-04-10 and last updated on 2026-06-17.

CVE-2023-26066

CVE-2023-26066 is a critical-severity vulnerability in Lexmark Cxtpc Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-129.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-129
Affected product: Lexmark Cxtpc Firmware
Published: 2023-04-10
Last modified: 2026-06-17

Description

Certain Lexmark devices through 2023-02-19 have Improper Validation of an Array Index.

Frequently asked questions

What is CVE-2023-26066?: Certain Lexmark devices through 2023-02-19 have Improper Validation of an Array Index.
How severe is CVE-2023-26066?: CVE-2023-26066 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-26066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26066?: CVE-2023-26066 primarily affects Lexmark Cxtpc Firmware. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-26066?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-26066 published?: CVE-2023-26066 was published on 2023-04-10 and last updated on 2026-06-17.

References

Affected products (26)

cpe:2.3:o:lexmark:cxtpc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cstpc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxtct_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxtpm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cxtmm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mslsg_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxlsg_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mslbd_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxlbd_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:msngm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxngm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxtgm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:msngw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mstgw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mxtgw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cslbn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cslbl_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cxlbn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cxlbl_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cstzj_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:csnzj_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:cxtzj_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:lw80_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:lhs60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:lr_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:lp_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Lexmark Cxtpc Firmware

CVE-2023-26070 — Critical (CVSS 9.8): Certain Lexmark devices through 2023-02-19 mishandle Input Validation (issue 4 of 4).
CVE-2023-26069 — Critical (CVSS 9.8): Certain Lexmark devices through 2023-02-19 mishandle Input Validation (issue 3 of 4).
CVE-2023-26068 — Critical (CVSS 9.8): Certain Lexmark devices through 2023-02-19 mishandle Input Validation (issue 2 of 4).
CVE-2023-26065 — Critical (CVSS 9.8): Certain Lexmark devices through 2023-02-19 have an Integer Overflow.
CVE-2023-26064 — Critical (CVSS 9.8): Certain Lexmark devices through 2023-02-19 have an Out-of-bounds Write.
CVE-2023-26063 — Critical (CVSS 9.8): Certain Lexmark devices through 2023-02-19 access a Resource By Using an Incompatible Type.

All CVEs affecting Lexmark Cxtpc Firmware →

Other CWE-129 (Improper Validation of Array Index) vulnerabilities

CVE-2020-27485 — Critical (CVSS 9.9): Garmin Forerunner 235 before 8.20 is affected by: Array index error. The component is: ConnectIQ TVM. The attack vector…
CVE-2020-27483 — Critical (CVSS 9.9): Garmin Forerunner 235 before 8.20 is affected by: Array index error. The component is: ConnectIQ TVM. The attack vector…
CVE-2026-21413 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the lossless_jpeg_load_raw functionality of LibRaw Commit 0b56545…
CVE-2025-27034 — Critical (CVSS 9.8): Memory corruption while selecting the PLMN from SOR failed list.
CVE-2025-3357 — Critical (CVSS 9.8): IBM Tivoli Monitoring 6.3.0.7 through 6.3.0.7 Service Pack 19 could allow a remote attacker to execute arbitrary code…
CVE-2024-45569 — Critical (CVSS 9.8): Memory corruption while parsing the ML IE due to invalid frame content.

Browse all CWE-129 (Improper Validation of Array Index) vulnerabilities →