CVE-2017-1000479Pfsense CSRF
pfSense versions 2.4.1 and lower are vulnerable to clickjacking attacks in the CSRF error page resulting in privileged execution of arbitrary code, because the error detection occurs before an X-Frame-Options header is set.
Published Jan 3, 2018 · Updated Aug 7, 2026
Key Facts
Patch immediately- CVE-2017-1000479 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Pfsense (Netgate), Opnsense (Opnsense Project).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 32% probability of exploitation in the next 30 days.
- Fixed versions are available, including Pfsense <=2.4.1, Opnsense 16.1.16, Pfsense 2.4.1.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
8.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
32%
Higher than 98.2% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
51/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Advisories And Exploit References
Description
pfSense versions 2.4.1 and lower are vulnerable to clickjacking attacks in the CSRF error page resulting in privileged execution of arbitrary code, because the error detection occurs before an X-Frame-Options header is set. This is fixed in 2.4.2-RELEASE.
OPNsense, a 2015 fork of pfSense, was not vulnerable since version 16.1.16 released on June 06, 2016. The unprotected web form was removed from the code during an internal security audit under "possibly insecure" suspicions.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| PfsenseNetgate | See advisory | 2.4.1 |
| OpnsenseOpnsense Project | See advisory | 16.1.16 |
Patched Releases
Pfsense
<=2.4.1
Opnsense
16.1.16
Timeline
Publicly disclosed
Jan 3, 2018
Last updated
Aug 7, 2026
Weakness Type
- CWE-352 Cross-Site Request Forgery (CSRF)
References
- advisorydoc.pfsense.org · 2.4.2_New_Features_and_Changes
- advisorynetgate.com · pfsense-2-4-2-release-p1-and-2-3-5-release-p1-n…
- patchgithub.com · d218b225
- patchgithub.com · 386d89b07
- exploitMSF pfsense_clickjacking.rb
FAQ
Common Questions.
pfSense versions 2.4.1 and lower are vulnerable to clickjacking attacks in the CSRF error page resulting in privileged execution of arbitrary code, because the error detection occurs before an X-Frame-Options header is set.
Affected: Pfsense (Netgate); Opnsense (Opnsense Project). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Pfsense <=2.4.1, Opnsense 16.1.16, Pfsense 2.4.1.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2017-1000479 On Your Attack Surface?
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