CVE-2021-33393

Name: CVE-2021-33393
Creator: NVD / NIST
Published: 2021-06-09T22:15:08.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 58.73%

Last modified Jun 17, 2026

CVE-2021-33393 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. lfs/backup in IPFire 2.25-core155 does not ensure that /var/ipfire/backup/bin/backup.pl is owned by the root account. It might be owned by an unprivileged account, which could potentially be used to install a Trojan horse backup.pl script that is later executed by root. EPSS estimates a 58.73% chance of exploitation in the next 30 days.

Description

lfs/backup in IPFire 2.25-core155 does not ensure that /var/ipfire/backup/bin/backup.pl is owned by the root account. It might be owned by an unprivileged account, which could potentially be used to install a Trojan horse backup.pl script that is later executed by root. Similar problems with the ownership/permissions of other files may be present as well.

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

58.73%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Ipfire	Ipfire	< 2.25	—
Ipfire	Ipfire	2.25	Core Update141

References

http://packetstormsecurity.com/files/163158/IPFire-2.25-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/MucahitSaratar/ipfire-2-25-auth-rceExploit, Third Party Advisory
https://github.com/ipfire/ipfire-2.x/commit/6769d909306d7bdc43d64598872126fcf1b217f6Patch, Third Party Advisory
https://github.com/ipfire/ipfire-2.x/commits/master?since=2021-05-17&until=2021-05-17Third Party Advisory
http://packetstormsecurity.com/files/163158/IPFire-2.25-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/MucahitSaratar/ipfire-2-25-auth-rceExploit, Third Party Advisory
https://github.com/ipfire/ipfire-2.x/commit/6769d909306d7bdc43d64598872126fcf1b217f6Patch, Third Party Advisory
https://github.com/ipfire/ipfire-2.x/commits/master?since=2021-05-17&until=2021-05-17Third Party Advisory

Timeline

Published: Jun 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33393?

How severe is CVE-2021-33393?

CVE-2021-33393 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 58.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33393?

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-2021-33393?

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

Scan your code now

Source: NVD / NIST