CVE-2021-4240: Insufficient Entropy in PHPServerMon PRNG

medium Affects phpservermon/phpservermon. Feed 2026.10.29.4, updated 2026-10-29; published 2022-11-16; advisory modified 2024-02-20.

Insufficient Entropy in PHPServerMon PRNG

Package: phpservermon/phpservermon Composer
Affected versions: <3.6.0
Fixed in: 3.6.0
Severity: medium CVSS 5.3
Exploitation: not on CISA KEV · EPSS 1% (59.2th percentile)
Published: 2022-11-16
Source: osv.dev

References

CWE-1241 CWE-330 CWE-331

NVD record phpservermon/phpservermon advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

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Related advisories

CVE-2021-4097 medium phpservermon is vulnerable to CRLF Injection same package: phpservermon/phpservermon
CVE-2021-4241 medium PHPServerMon PRNG has Insufficient Entropy same package: phpservermon/phpservermon
CVE-2018-18921 medium CSRF in PHP Server Monitor before 3.3.2 same package: phpservermon/phpservermon
CVE-2024-5312 medium PHP Server Monitor vulnerable to Cross-site Scripting same package: phpservermon/phpservermon
CVE-2021-34646 critical Versions up to, and including, 5.4.3, of the Booster for WooCommerce WordPress plugin are same weakness: CWE-330
CVE-2017-17091 high wp-admin/user-new.php in WordPress before 4.9.1 sets the newbloguser key to a string that same weakness: CWE-330