CVE-2021-41282

Name: CVE-2021-41282
Creator: NVD / NIST
Published: 2022-03-01T23:15:08.347+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 87.11%

Last modified Jun 17, 2026

CVE-2021-41282 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. EPSS estimates a 87.11% chance of exploitation in the next 30 days.

Description

diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (i.e., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

87.11%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Pfsense	Pfsense	2.5.2

References

http://packetstormsecurity.com/files/166208/pfSense-2.5.2-Shell-Upload.htmlExploit, Third Party Advisory, VDB Entry
https://docs.netgate.com/pfsense/en/latest/releases/22-01_2-6-0.htmlRelease Notes, Third Party Advisory
https://www.shielder.it/advisories/Third Party Advisory
https://www.shielder.it/advisories/pfsense-remote-command-execution/Exploit, Third Party Advisory
http://packetstormsecurity.com/files/166208/pfSense-2.5.2-Shell-Upload.htmlExploit, Third Party Advisory, VDB Entry
https://docs.netgate.com/pfsense/en/latest/releases/22-01_2-6-0.htmlRelease Notes, Third Party Advisory
https://www.shielder.it/advisories/Third Party Advisory
https://www.shielder.it/advisories/pfsense-remote-command-execution/Exploit, Third Party Advisory

Timeline

Published: Mar 1, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41282?

How severe is CVE-2021-41282?

CVE-2021-41282 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 87.11% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41282?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41282?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST