What’s Vulnerable › Vulnerabilities

CVE-2021-33393

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 59.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-09 · updated 2026-06-17

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.

Affected products

• IPFire.org IPFire: before 2.25; 2.25-core_update141, 2.25-core_update142, 2.25-core_update143, 2.25-core_update144, 2.25-core_update145, 2.25-core_update146 (+8) — fixed in 2.25

How to fix

Upgrade to a fixed version: IPFire.org IPFire 2.25. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/163158/IPFire-2.25-Remote-Code-Execution.html
• https://github.com/MucahitSaratar/ipfire-2-25-auth-rce
• https://github.com/ipfire/ipfire-2.x/commit/6769d909306d7bdc43d64598872126fcf1b217f6
• https://github.com/ipfire/ipfire-2.x/commits/master?since=2021-05-17&until=2021-05-17
• http://packetstormsecurity.com/files/163158/IPFire-2.25-Remote-Code-Execution.html
• https://github.com/MucahitSaratar/ipfire-2-25-auth-rce
• https://github.com/ipfire/ipfire-2.x/commit/6769d909306d7bdc43d64598872126fcf1b217f6
• https://github.com/ipfire/ipfire-2.x/commits/master?since=2021-05-17&until=2021-05-17

Get alerted when CVE-2021-33393 or the next vulnerability affects your stack