What is CVE-2019-12949?

CVE-2019-12949 is a medium-severity vulnerability in Netgate Pfsense, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-06-25.

How severe is CVE-2019-12949?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2019-12949 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Netgate Pfsense

CVE-2019-12949

In pfSense 2.4.4-p2 and 2.4.4-p3, if it is possible to trick an authenticated administrator into clicking on a button on a phishing page, an attacker can leverage XSS to upload arbitrary executable code, via diag_command.php and rrd_fetch_json.php (timePeriod parameter), to a server. Then, the remote attacker can run any command with root privileges on that server.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-06-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.030 (87.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000

Affected products

Netgate Pfsense — versions 2.4.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/tarantula-team/CVE-2019-12949 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-12949?: CVE-2019-12949 is a medium-severity vulnerability in Netgate Pfsense, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-06-25.
How severe is CVE-2019-12949?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-12949 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.