Netgate pfSense CE up to 2.9.0 CARP Virtual IP VHID os command injection

Summaryinfo

A vulnerability has been found in Netgate pfSense CE up to 2.9.0 and classified as very critical. This vulnerability affects the function interface_ipalias_configure/get_carp_interface_status of the component CARP Virtual IP. Performing a manipulation of the argument VHID results in os command injection. This vulnerability is known as CVE-2026-111217. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in Netgate pfSense CE up to 2.9.0. This affects the function interface_ipalias_configure/get_carp_interface_status of the component CARP Virtual IP. The manipulation of the argument VHID with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Netgate pfSense CE through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with Virtual IP edit privileges to execute commands as root by storing an unvalidated CARP VHID. Attackers can supply a VHID containing shell metacharacters that executes via interface_ipalias_configure() ifconfig calls or get_carp_interface_status() when CARP status is rendered.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-111217 since 10/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/15/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Firewall Software

Vendor

• Netgate

Name

• pfSense CE

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9.0

License

• open-source

CPE 2.3info

• 🔒
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CPE 2.2info

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• 🔒
• 🔒

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Entryinfo

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