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CVE-2026-45158

Opnsense remote code execution

9.1 CRITICALEPSS 0.82%
  1. Published13 May 2026

Description

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configured interface, which is processed by a shell script, allowing remote code execution as root on the underlying operating system. This vulnerability is fixed in 26.1.8.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Opnsense< 26.1.8

Remediation

Fixed in
Opnsense≥ 26.1.8

References

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Frequently asked

Is CVE-2026-45158 being actively exploited?

CVE-2026-45158 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.82%.

How severe is CVE-2026-45158?

CVE-2026-45158 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.82% probability of exploitation.

Which products are affected by CVE-2026-45158?

Affected products include Opnsense.

How do I fix CVE-2026-45158?

Upgrade affected software to a fixed version, for example Opnsense 26.1.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.