CVE-2025-34073

An unauthenticated command injection vulnerability exists in stamparm/maltrail (Maltrail) versions <=0.54. A remote attacker can execute arbitrary operating system commands via the username parameter in a POST request to the /login endpoint. This occurs due to unsafe handling of user-supplied input passed to subprocess.check_output() in core/http.py, allowing injection of shell metacharacters. Exploitation does not require authentication and commands are executed with the privileges of the Maltrail process.

CVSS v4.0

10.0 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

5.67% chance of exploitation in the next 30 days, 92th percentile

Nuclei

critical

Published

2025-07-02

Updated

2026-05-14

Proof-of-concept exploits (2)

• https://huntr.com/bounties/be3c5204-fbd9-448d-b97c-96a8d2941e87
• infcodev/pentesting_scripts0★ · 2026-01-03

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34073.yaml

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/unix/http/maltrail_rce.rb

References

• CVE Record
• NVD entry

Related

• CVE-2023-1389
• CVE-2023-27163
• CVE-2025-34072
• CVE-2025-34074
• CVE-2025-34071
• CVE-2025-34076