CVE-2021-3603
Publication date 17 June 2021
Last updated 26 August 2025
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libphp-phpmailer | 26.04 LTS resolute |
Not affected
|
| 25.10 questing |
Not affected
|
|
| 24.04 LTS noble |
Not affected
|
|
| 22.04 LTS jammy |
Fixed 6.2.0-2ubuntu0.1~esm1
|
|
| 20.04 LTS focal |
Fixed 6.0.6-0.1ubuntu0.1~esm1
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release |
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ccdm94
the vulnerable code section seems to have been introduced by commit 77c0bc8d (v.5.2.15). For this reason, bionic and earlier are not vulnerable.
Severity score breakdown
CVSS version: CVSS v3.0
Base score
8.1 · High
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-5956-1
- PHPMailer vulnerabilities
- 15 March 2023