CVE-2017-1000479: pfSense versions 2.4.1 and lower are vulnerable to clickjacking attacks in the CSRF error page resulting in pr

Q: How do I fix CVE-2017-1000479?

pfsense: upgrade to newer than 2.4.1; opnsense: upgrade to 16.1.16. Exact commands for each OS are on this page.

Q: Is CVE-2017-1000479 being exploited?

CVE-2017-1000479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-1000479 affect?

CVE-2017-1000479 affects pfsense, opnsense. Severity is high (CVSS 8.8). 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

Q: How urgent is CVE-2017-1000479?

Priority 60/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference

This week

HIGH 8.8UPGRADEUPGRADE

CVE-2017-1000479 is a high-severity flaw (CVSS 8.8) affecting pfsense, opnsense. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 "

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	31.7% (top 2%)
CISA exploited list	No
Weakness	CWE-352
Published	2018-01-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netgate · opnsense project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-01-03 18:29 UTCPublished CVE record published
2026-06-17 00:59 UTCUpdated Record last modified

netgate pfsense UPGRADE

Affected: <= 2.4.1

Fixed in: newer than 2.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pfsense || rpm -q pfsense || pfsense --version

2. UPGRADE to newer than 2.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pfsense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pfsense

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

opnsense project opnsense UPGRADE

Affected: < 16.1.16

Fixed in: 16.1.16

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opnsense || rpm -q opnsense || opnsense --version

2. UPGRADE to 16.1.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opnsense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opnsense

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: Clickjacking Vulnerability In CSRF Error Page pfSense

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-1000479?

pfsense: upgrade to newer than 2.4.1; opnsense: upgrade to 16.1.16. Exact commands for each OS are on this page.

Is CVE-2017-1000479 being exploited?

CVE-2017-1000479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-1000479 affect?

CVE-2017-1000479 affects pfsense, opnsense. Severity is high (CVSS 8.8). 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

How urgent is CVE-2017-1000479?

Priority 60/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference

Software pages

pfSense and OPNsense vulnerabilities

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References

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