Vulnerability Description
PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parameter to validateAddress() is set to 'php' (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Phpmailer Project | Phpmailer | <= 6.4.1 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/Product
- https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/Product
FAQ
What is CVE-2021-3603?
CVE-2021-3603 is a vulnerability with a CVSS score of 8.1 (HIGH). PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parame...
How severe is CVE-2021-3603?
CVE-2021-3603 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3603?
Check the references section above for vendor advisories and patch information. Affected products include: Phpmailer Project Phpmailer, Fedoraproject Fedora.