Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck

CVE-2026-111225Netgate pfSense CE 2.5.0 through 2.9.0 OS Command Injection via openvpn.learn-address.sh

Medium 5.0

In plain English

A medium-severity OS command injection in pfSense CE from Netgate. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.2% (higher than 94% of all known vulnerabilities).

Severity (CVSS 3.1)5.0Medium

Exploit odds (30 days)6.2%top 6.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Netgate pfSense CE 2.5.0 through 2.9.0 contains an OS command injection vulnerability in openvpn.learn-address.sh that allows authenticated VPN clients to execute commands as the unbound user. Attackers can embed shell metacharacters in the certificate common name or username, which is interpolated unquoted into su -c strings, when DNS Resolver client registration is enabled.

Affected products (as reported)

Vendor	Product	Versions
Netgate	pfSense CE	2.5.0 – through 2.9.0

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

References

https://github.com/abraxas/pfsense-ovpn-learn-cn exploit, technical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/sbin/openvpn.learn-address.sh#L57-L62 technical-description
VulnCheck Advisory: Netgate pfSense CE 2.5.0 through 2.9.0 OS Command Injection via openvpn.learn-address.sh third-party-advisory