CVE-2017-9841: in the CISA KEV catalogue
PHPUnit Command Injection Vulnerability. CISA added CVE-2017-9841 to the Known Exploited Vulnerabilities catalogue on 2022-02-15 with a default due date of 2022-08-15. Known ransomware campaign use: Unknown. Forensic triage flag: No.
PHPUnit allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with a "<?php " substring, as demonstrated by an attack on a site with an exposed /vendor folder, i.e., external access to the /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php URI. (CISA description)
- Vendor / product
- PHPUnit PHPUnit
- CWE
- CWE-94
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 100%, percentile 99 (scored 2026-11-03)
EPSS puts nearly every time in 100 odds (100%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2017-9841 in the CISA KEV catalogue?
Yes. CISA added CVE-2017-9841 (PHPUnit Command Injection Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-02-15. CISA's default due date for it is 2022-08-15.
Is CVE-2017-9841 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2017-9841. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2017-9841?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2017-9841