CVE-2021-42840

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 58.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-10-22 · updated 2026-06-17
Weakness: CWE-434

Description

SuiteCRM before 7.11.19 allows remote code execution via the system settings Log File Name setting. In certain circumstances involving admin account takeover, logger_file_name can refer to an attacker-controlled PHP file under the web root, because only the all-lowercase PHP file extensions were blocked. NOTE: this issue exists because of an incomplete fix for CVE-2020-28328.

Affected products

salesagility SuiteCRM: before 7.11.19 — fixed in 7.11.19

How to fix

Upgrade to a fixed version: salesagility SuiteCRM 7.11.19. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/165001/SuiteCRM-7.11.18-Remote-Code-Execution.html
https://docs.suitecrm.com/admin/releases/7.11.x/#_7_11_19
https://github.com/rapid7/metasploit-framework/commits/master/modules/exploits/linux/http/suitecrm_log_file_rce.rb
https://suitecrm.com/time-to-upgrade-suitecrm-7-11-19-7-10-30-lts-released/
https://theyhack.me/SuiteCRM-RCE-2/
http://packetstormsecurity.com/files/165001/SuiteCRM-7.11.18-Remote-Code-Execution.html
https://docs.suitecrm.com/admin/releases/7.11.x/#_7_11_19
https://github.com/rapid7/metasploit-framework/commits/master/modules/exploits/linux/http/suitecrm_log_file_rce.rb
https://suitecrm.com/time-to-upgrade-suitecrm-7-11-19-7-10-30-lts-released/
https://theyhack.me/SuiteCRM-RCE-2/

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