phpservermon is vulnerable to CRLF Injection

MEDIUM 5.4CVE-2021-4097 · GHSA-8qv8-fq5w-p966 · Published 12/12/2021 · updated 17/06/2026

In short

CVE-2021-4097 is a MEDIUM (CVSS 5.4) vulnerability affecting phpservermon/phpservermon, php server monitor (phpservermonitor).
Chance of exploitation in the next 30 days (EPSS): 0.87%, higher than 59.0% of all vulnerabilities.
Fix: update to 3.6.0 or later.

Package	Affected versions	Patched versions
phpservermon/phpservermon Packagist	`≤ 3.5.2`	No fix yet
php server monitor phpservermonitor	`< 3.6.0`	`3.6.0`

phpservermon is vulnerable to Improper Neutralization of CRLF Sequences.

NVD description

phpservermon is vulnerable to Improper Neutralization of CRLF Sequences

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Package

Affected versions

Patched versions

Packagist

≤ 3.5.2

No fix yet

< 3.6.0

3.6.0

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