CVE-2026-111227
Netgate pfSense CE through 2.9.0 CRLF Injection via services_unbound_acls.php
Description
Netgate pfSense CE through 2.9.0 contains a CRLF injection vulnerability in services_unbound_acls.php that allows authenticated users with the DNS Resolver: Access Lists privilege to inject Unbound configuration directives. Attackers can embed CR/LF characters in the aclname or aclaction fields written to access_lists.conf to add local-data, local-zone, or forward-zone directives and control DNS answers served to LAN clients.
INFO
Published Date :
Oct. 15, 2026, 7:17 p.m.
Last Modified :
Oct. 21, 2026, 1:17 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-111227
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update pfSense CE to version 2.9.1 or later.
- Review and sanitize Unbound configuration directives.
- Restrict access to DNS Resolver settings.
- Monitor DNS query logs for anomalies.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-111227.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-111227 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-111227
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-111227 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-111227 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 21, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-111227', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-21T01:10:23.044863Z'} -
Initial Analysis by [email protected]
Oct. 19, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:pfsense:pfsense:*:*:*:*:community:*:*:* versions up to (including) 2.9.0 Added Reference Type VulnCheck: https://abraxaslabs.tech/research/pfsense-ce-leftovers Types: Issue Tracking Added Reference Type VulnCheck: https://github.com/abraxas/pfsense-unbound-acl-crlf Types: Third Party Advisory Added Reference Type VulnCheck: https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/unbound.inc#L1094-L1112 Types: Product Added Reference Type VulnCheck: https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/services_unbound_acls.php#L121-L142 Types: Product Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-crlf-injection-via-services-unbound-acls-php Types: Third Party Advisory -
New CVE Received by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Description Netgate pfSense CE through 2.9.0 contains a CRLF injection vulnerability in services_unbound_acls.php that allows authenticated users with the DNS Resolver: Access Lists privilege to inject Unbound configuration directives. Attackers can embed CR/LF characters in the aclname or aclaction fields written to access_lists.conf to add local-data, local-zone, or forward-zone directives and control DNS answers served to LAN clients. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L/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 Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L Added CWE CWE-93 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/111xxx/CVE-2026-111227.json">CVE-2026-111227</a> Added Reference https://abraxaslabs.tech/research/pfsense-ce-leftovers Added Reference https://github.com/abraxas/pfsense-unbound-acl-crlf Added Reference https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/unbound.inc#L1094-L1112 Added Reference https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/services_unbound_acls.php#L121-L142 Added Reference https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-crlf-injection-via-services-unbound-acls-php