CVE-2017-9841

What the flaw is

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.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply updates per vendor instructions.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

87 public repositories referencing this CVE have been catalogued on GitHub. That volume usually means a reliable, widely-reproduced exploit. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

• 0day404/vulnerability-poc
• 0xIceKing/dfcf_def_atk_2024
• 20142995/Goby
• 20142995/nuclei-templates
• ARPSyndicate/cve-scores
• ARPSyndicate/cvemon
• ARPSyndicate/kenzer-templates
• ArrestX/--POC

Showing 8 of 87. Full list in the trickest/cve dataset.

Vendor advisories

• nvd.nist.gov/vuln/detail/CVE-2017-9841

Primary sources

• NVD entry — CVSS score, CPE list and references
• CISA KEV catalog — the source for this page
• CVE Record at cve.org