OPNsense vulnerabilities: known CVEs & security history
OPNsense · Network security · 7 tracked CVEs · 0 actively exploited · updated November 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all OPNsense release lines — 7 in total. A CVE here doesn't mean your version is affected — check OPNsense's current status and the safe version to run.
Known OPNsense CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-39004 | critical | 9.8 | 1% | 2023 |
| CVE-2026-45158 | critical | 9.1 | 1% | 2026 |
| CVE-2026-44194 | critical | 9.1 | 6% | 2026 |
| CVE-2026-44193 | critical | 9.1 | 1% | 2026 |
| CVE-2026-34578 | high | 8.2 | 0% | 2026 |
| CVE-2023-39003 | high | 7.5 | 1% | 2023 |
| CVE-2026-44195 | medium | 5.3 | 0% | 2026 |
Is my OPNsense version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your OPNsense version → · Monitor OPNsense for new CVEs →
OPNsense vulnerabilities — frequently asked
How many known vulnerabilities does OPNsense have?
IsItPatched tracks 7 CVEs for OPNsense. 4 are critical-severity and 2 high-severity. These span every release line — what matters is whether the version you run is affected.
Does OPNsense have any actively-exploited vulnerabilities?
None of OPNsense's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe OPNsense vulnerability?
Among tracked issues, CVE-2023-39004 (CRITICAL, CVSS 9.8) ranks highest — a Incorrect permission assignment weakness.
Is OPNsense safe to use?
It depends on the version. The latest supported OPNsense release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: OPNsense security status · OPNsense end-of-life · actively-exploited CVEs. Always verify against OPNsense's advisories — see our disclaimer.