Vulnerability in Opnsense Core
CVE-2026-44195
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockout_handler allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. By interjecting a crafted username containing a success keyword ("Accepted" or "Successful login") between normal brute-force attempts, an attacker can prevent the failure counter from ever reaching the lockout threshold. This vulnerability is fixed in 26.1.7.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Opnsense Core — versions < 26.1.7
- Opnsense
Weakness classification (CWE)
References
- github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42 (Exploit, Mitigation, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit)
Frequently asked questions
- What is CVE-2026-44195?
- CVE-2026-44195 is a medium-severity vulnerability in Opnsense Core, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 5.3/10. Published 2026-05-13.
- How severe is CVE-2026-44195?
- Medium severity. CVSS v3 base score is 5.3 out of 10.