CVE-2026-44195
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.
Does this matter?
Lower severity and a low EPSS score (0.32%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 0.32% probability · 25th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-307
- Affected
- opnsense/opnsense
- Source
- security-advisories@github.com
References
- https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42Exploit, Mitigation, Vendor Advisory
- https://gist.github.com/sopex/b9786e72e2a5d9b1bbd81ed8477c351bExploit
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.