CVE & CISA-KEV Catalog

CVE-2021-3603

HIGHEPSS 81th pctl
8.1
CVSS v3
NVD

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.

CWE-829

How to fix

Remediation Available
libphp-phpmailerDebian
Fixed in:6.6.3-1CVE-2021-3603
Fixed in:6.6.3-1CVE-2021-3603
Fixed in:6.6.3-1CVE-2021-3603
libphp-phpmailerUbuntu
Fixed in:5.2.14+dfsg-1ubuntu0.1~esm1USN-5956-1
Fixed in:5.2.14+dfsg-2.3+deb9u2ubuntu0.1~esm1USN-5956-1
Fixed in:6.0.6-0.1ubuntu0.1~esm1USN-5956-1
Fixed in:6.2.0-2ubuntu0.1~esm1USN-5956-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.26%probability of exploitation in 30 days
81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Product1
Embed a live status badge for CVE-2021-3603
CVE-2021-3603 severity badge

Markdown

[![CVE-2021-3603](https://tridentstack.com/cve/badge/CVE-2021-3603.svg)](https://tridentstack.com/cve/CVE-2021-3603)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-3603"><img src="https://tridentstack.com/cve/badge/CVE-2021-3603.svg" alt="CVE-2021-3603"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.