CVE-2017-1000479
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 31.7%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.0
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 31.70% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-352
- Affected
- netgate/pfsense · opnsense project/opnsense
- Source
- cve@mitre.org
EPSS moved from 31.7% on 21 September 2026 to 31.7% on 27 October 2026, peaking at 32.8% on 22 September 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://www.openwall.com/lists/oss-security/2017/11/22/7Exploit, Mailing List, Third Party Advisory
- https://doc.pfsense.org/index.php/2.4.2_New_Features_and_ChangesIssue Tracking, Vendor Advisory
- https://github.com/opnsense/core/commit/d218b225Patch, Third Party Advisory
- https://github.com/pfsense/pfsense/commit/386d89b07Patch, Third Party Advisory
- https://www.netgate.com/blog/pfsense-2-4-2-release-p1-and-2-3-5-release-p1-now-available.htmlThird Party Advisory
- https://www.securify.nl/en/advisory/SFY20171101/clickjacking-vulnerability-in-csrf-error-page-pfsense.htmlExploit, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2017/11/22/7Exploit, Mailing List, Third Party Advisory
- https://doc.pfsense.org/index.php/2.4.2_New_Features_and_ChangesIssue Tracking, Vendor Advisory
- https://github.com/opnsense/core/commit/d218b225Patch, Third Party Advisory
- https://github.com/pfsense/pfsense/commit/386d89b07Patch, Third Party Advisory
- https://www.netgate.com/blog/pfsense-2-4-2-release-p1-and-2-3-5-release-p1-now-available.htmlThird Party Advisory
- https://www.securify.nl/en/advisory/SFY20171101/clickjacking-vulnerability-in-csrf-error-page-pfsense.htmlExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.