TI-2021-03100 Aliases CVE-2021-4241 GHSA-hc4j-7mqg-cxjj

phpservermon User.php setUserLoggedIn predictable algorithm in random number generator

MEDIUM 57CWE-331Published 2022-11-15 · Updated 2025-04-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

A vulnerability, which was classified as problematic, was found in phpservermon. Affected is the function setUserLoggedIn of the file src/psm/Service/User.php. The manipulation leads to use of predictable algorithm in random number generator. The exploit has been disclosed to the public and may be used. The name of the patch is bb10a5f3c68527c58073258cb12446782d223bc3. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-213744.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00851 58th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed phpservermon/phpservermon (Packagist): 3.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
unspecified	phpservermon	all versions	—	No fix listed	CNA
—	phpservermon/phpservermon (Packagist)	before 3.6.0	3.6.0	Patch available	GHSA-hc4j-7mqg-cxjj

phpservermon Vendorunspecified Affected all versions Fixed in — No fix listed CNA
phpservermon/phpservermon (Packagist) Vendor— Affected before 3.6.0 Fixed in 3.6.0 Patch available GHSA-hc4j-7mqg-cxjj

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:phpservermonitor:php_server_monitor:-:::::::*	not specified by NVD	Vulnerable	PHP Server Monitor

cpe:2.3:a:phpservermonitor:php_server_monitor:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·PHP Server Monitor

Remediation

Fix · GHSA-hc4j-7mqg-cxjj phpservermon/phpservermon (Packagist) Fixed in 3.6.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-4241
2026-10-03 Alias added: GHSA-hc4j-7mqg-cxjj

References

Other 2

TI-2021-03099 phpservermon User.php generatePasswordResetToken predictable algorithm in random number generator CVSS 3.1MEDIUM 5.3
TI-2018-13402 PHP Server Monitor before 3.3.2 has CSRF, as demonstrated by a Delete action. CVSS 3.0MEDIUM 6.5
TI-2021-02976 CRLF Injection in phpservermon/phpservermon CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences