Is CVE-2015-6509 actively exploited?

No active exploitation of CVE-2015-6509 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2015-6509 be exploited remotely?

Yes. CVE-2015-6509 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2015-6509?

CVE-2015-6509 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2015-6509

CWE-79Published: August 18, 2015· Updated: Jun 17, 2026

4.3

CVSS v3.1

Official Description

Multiple cross-site scripting (XSS) vulnerabilities in pfSense before 2.2.3 allow remote attackers to inject arbitrary web script or HTML via the (1) proxypass parameter to system_advanced_misc.php; (2) adaptiveend, (3) adaptivestart, (4) maximumstates, (5) maximumtableentries, or (6) aliasesresolveinterval parameter to system_advanced_firewall.php; (7) proxyurl, (8) proxyuser, or (9) proxyport parameter to system_advanced_misc.php; or (10) name, (11) notification_name, (12) ipaddress, (13) password, (14) smtpipaddress, (15) smtpport, (16) smtpfromaddress, (17) smtpnotifyemailaddress, (18) smtpusername, or (19) smtppassword parameter to system_advanced_notifications.php.

NVD Source

Technical Analysis

CVE-2015-6509 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.