CVE-2021-4241: A vulnerability, which was classified as problematic, was found in phpservermon

Routine

LOW 2.6MITIGATE

CVE-2021-4241 is a low-severity flaw (CVSS 2.6) affecting php server monitor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 v

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	2.6 (Low)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-331, CWE-330
Published	2022-11-15
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: phpservermonitor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-11-15 23:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

phpservermonitor php server monitor MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy php-server-monitor || rpm -q php-server-monitor || php-server-monitor --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4241?

php server monitor: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-4241 being exploited?

CVE-2021-4241 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4241 affect?

CVE-2021-4241 affects php server monitor. Severity is low (CVSS 2.6). 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 generato

How urgent is CVE-2021-4241?

Priority 29/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-4240 LOW 2.6 MITIGATE A vulnerability, which was classified as problematic, was found in phpservermon
CVE-2021-4097 MEDIUM 5.4 UPGRADE phpservermon is vulnerable to Improper Neutralization of CRLF Sequences

References

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