CVE-2026-111217
HIGH 8.6Netgate 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.
Severe if exploited (CVSS 8.6), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
7.0%chance of exploitation in 30 days · 94th percentile
Impact if exploited
8.6CVSS 4.0 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires an admin / high-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Pfsense | Pfsense | ≤ 2.9.0 |
All CVSS metrics
- HIGH 8.6 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - HIGH 7.2 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - HIGH 8.6 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 7.2 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/abraxas/pfsense-carp-vhid CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133 - https://abraxaslabs.tech/research/pfsense-carp-vhid CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133
Advisories
- https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-os-command-injection-via-carp-vhid CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-102329 EUVD · EUVD-2026-102329
Technical & other
- https://abraxaslabs.tech/research/pfsense-ce-leftovers CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133 - https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/pfSense/include/www/firewall_virtual_ip.inc#L200 CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133 - https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/interfaces.inc#L3236-L3238 CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133 - https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/pfsense-utils.inc#L794 CVE record · VulnCheck · Updated 2026-10-15T18:46:19.325Z
NVD · CVE-2026-111217 · Updated 2026-10-21T01:17:20.133